tasksel: command not found -- How to fix this error?

 


tasksel: command not found

When i was trying to install Lamp using the following command

sudo tasksel install lamp-server


I got the following error

sudo: tasksel: command not found




I tried the below steps



To overcome this error i typed the following command




sudo apt-get install tasksel


This command gave the following error


E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 4869 (unattended-upgr)

N: Be aware that removing the lock file is not a solution and may break your system.

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?




Next step i ran the following command

sudo apt update

It was executed successfully . You can see the below screenshot of the output recieved




Hit:1 http://in.archive.ubuntu.com/ubuntu focal InRelease

Hit:2 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease

Hit:3 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease

Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease

Reading package lists... Done

Building dependency tree

Reading state information... Done

151 packages can be upgraded. Run 'apt list --upgradable' to see them.




From the above result i found an command and i was curious to check what was it and ran the following command

'apt list --upgradable'


It gave the below output



It suggested the following package can be upgradable


Listing... Done

accountsservice/focal-updates,focal-security 0.6.55-0ubuntu12~20.04.5 amd64 [upgradable from: 0.6.55-0ubuntu12~20.04.4]

alsa-ucm-conf/focal-updates,focal-updates 1.2.2-1ubuntu0.11 all [upgradable from: 1.2.2-1ubuntu0.9]

apport-gtk/focal-updates,focal-updates,focal-security,focal-security 2.20.11-0ubuntu27.21 all [upgradable from: 2.20.11-0ubuntu27.18]

apport/focal-updates,focal-updates,focal-security,focal-security 2.20.11-0ubuntu27.21 all [upgradable from: 2.20.11-0ubuntu27.18]

bind9-dnsutils/focal-updates,focal-security 1:9.16.1-0ubuntu2.9 amd64 [upgradable from: 1:9.16.1-0ubuntu2.8]

bind9-host/focal-updates,focal-security 1:9.16.1-0ubuntu2.9 amd64 [upgradable from: 1:9.16.1-0ubuntu2.8]

bind9-libs/focal-updates,focal-security 1:9.16.1-0ubuntu2.9 amd64 [upgradable from: 1:9.16.1-0ubuntu2.8]

binutils-common/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

binutils-x86-64-linux-gnu/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

binutils/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

bluez-cups/focal-updates,focal-security 5.53-0ubuntu3.4 amd64 [upgradable from: 5.53-0ubuntu3.3]

bluez-obexd/focal-updates,focal-security 5.53-0ubuntu3.4 amd64 [upgradable from: 5.53-0ubuntu3.3]

busybox-static/focal-updates,focal-security 1:1.30.1-4ubuntu6.4 amd64 [upgradable from: 1:1.30.1-4ubuntu6.3]

command-not-found/focal-updates,focal-updates 20.04.5 all [upgradable from: 20.04.4]

cpio/focal-updates,focal-security 2.13+dfsg-2ubuntu0.3 amd64 [upgradable from: 2.13+dfsg-2]

fonts-opensymbol/focal-updates,focal-updates,focal-security,focal-security 2:102.11+LibO6.4.7-0ubuntu0.20.04.2 all [upgradable from: 2:102.11+LibO6.4.7-0ubuntu0.20.04.1]

gir1.2-accountsservice-1.0/focal-updates,focal-security 0.6.55-0ubuntu12~20.04.5 amd64 [upgradable from: 0.6.55-0ubuntu12~20.04.4]

gir1.2-mutter-6/focal-updates 3.36.9-0ubuntu0.20.04.2 amd64 [upgradable from: 3.36.9-0ubuntu0.20.04.1]

gir1.2-udisks-2.0/focal-updates 2.8.4-1ubuntu2 amd64 [upgradable from: 2.8.4-1ubuntu1]

gnome-control-center-data/focal-updates,focal-updates 1:3.36.5-0ubuntu3 all [upgradable from: 1:3.36.5-0ubuntu2]

gnome-control-center-faces/focal-updates,focal-updates 1:3.36.5-0ubuntu3 all [upgradable from: 1:3.36.5-0ubuntu2]

gnome-control-center/focal-updates 1:3.36.5-0ubuntu3 amd64 [upgradable from: 1:3.36.5-0ubuntu2]

gnome-shell-extension-desktop-icons/focal-updates,focal-updates 20.04.0-3~ubuntu20.04.6 all [upgradable from: 20.04.0-3~ubuntu20.04.3]

libaccountsservice0/focal-updates,focal-security 0.6.55-0ubuntu12~20.04.5 amd64 [upgradable from: 0.6.55-0ubuntu12~20.04.4]

libasound2-data/focal-updates,focal-updates 1.2.2-2.1ubuntu2.5 all [upgradable from: 1.2.2-2.1ubuntu2.4]

libasound2/focal-updates 1.2.2-2.1ubuntu2.5 amd64 [upgradable from: 1.2.2-2.1ubuntu2.4]

libatopology2/focal-updates 1.2.2-2.1ubuntu2.5 amd64 [upgradable from: 1.2.2-2.1ubuntu2.4]

libbinutils/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

libbluetooth3/focal-updates,focal-security 5.53-0ubuntu3.4 amd64 [upgradable from: 5.53-0ubuntu3.3]

libctf-nobfd0/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

libctf0/focal-updates,focal-security 2.34-6ubuntu1.3 amd64 [upgradable from: 2.34-6ubuntu1.1]

libdrm-amdgpu1/focal-updates 2.4.105-3~20.04.2 amd64 [upgradable from: 2.4.105-3~20.04.1]

libdrm-common/focal-updates,focal-updates 2.4.105-3~20.04.2 all [upgradable from: 2.4.105-3~20.04.1]

libdrm-intel1/focal-updates 2.4.105-3~20.04.2 amd64 [upgradable from: 2.4.105-3~20.04.1]

libdrm-nouveau2/focal-updates 2.4.105-3~20.04.2 amd64 [upgradable from: 2.4.105-3~20.04.1]

libdrm-radeon1/focal-updates 2.4.105-3~20.04.2 amd64 [upgradable from: 2.4.105-3~20.04.1]

libdrm2/focal-updates 2.4.105-3~20.04.2 amd64 [upgradable from: 2.4.105-3~20.04.1]

libegl-mesa0/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

libexiv2-27/focal-updates,focal-security 0.27.2-8ubuntu2.7 amd64 [upgradable from: 0.27.2-8ubuntu2.6]

libfprint-2-2/focal-updates 1:1.90.2+tod1-0ubuntu1~20.04.6 amd64 [upgradable from: 1:1.90.2+tod1-0ubuntu1~20.04.4]

libfprint-2-tod1/focal-updates 1:1.90.2+tod1-0ubuntu1~20.04.6 amd64 [upgradable from: 1:1.90.2+tod1-0ubuntu1~20.04.4]

libfreerdp2-2/focal-updates,focal-security 2.2.0+dfsg1-0ubuntu0.20.04.2 amd64 [upgradable from: 2.2.0+dfsg1-0ubuntu0.20.04.1]

libgbm1/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

libgcrypt20/focal-updates,focal-security 1.8.5-5ubuntu1.1 amd64 [upgradable from: 1.8.5-5ubuntu1]

libgl1-mesa-dri/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

libglapi-mesa/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

libglx-mesa0/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

libicu66/focal-updates,focal-security 66.1-2ubuntu2.1 amd64 [upgradable from: 66.1-2ubuntu2]

libjuh-java/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libllvm12/focal-updates 1:12.0.0-3ubuntu1~20.04.4 amd64 [upgradable from: 1:12.0.0-3ubuntu1~20.04.3]

libmbim-glib4/focal-updates 1.24.8-1~20.04 amd64 [upgradable from: 1.22.0-2]

libmbim-proxy/focal-updates 1.24.8-1~20.04 amd64 [upgradable from: 1.22.0-2]

libmm-glib0/focal-updates 1.16.6-2~20.04.1 amd64 [upgradable from: 1.12.8-1]

libmutter-6-0/focal-updates 3.36.9-0ubuntu0.20.04.2 amd64 [upgradable from: 3.36.9-0ubuntu0.20.04.1]

libmysqlclient21/focal-updates,focal-security 8.0.27-0ubuntu0.20.04.1 amd64 [upgradable from: 8.0.26-0ubuntu0.20.04.2]

libnautilus-extension1a/focal-updates 1:3.36.3-0ubuntu1.20.04.1 amd64 [upgradable from: 1:3.36.3-0ubuntu1]

libnetplan0/focal-updates 0.103-0ubuntu5~20.04.5 amd64 [upgradable from: 0.102-0ubuntu1~20.04.2]

libnss3/focal-updates,focal-security 2:3.49.1-1ubuntu1.6 amd64 [upgradable from: 2:3.49.1-1ubuntu1.5]

libpam-modules-bin/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]

libpam-modules/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]

libpam-runtime/focal-updates,focal-updates 1.3.1-5ubuntu4.3 all [upgradable from: 1.3.1-5ubuntu4.2]

libpam0g/focal-updates 1.3.1-5ubuntu4.3 amd64 [upgradable from: 1.3.1-5ubuntu4.2]

libprocps8/focal-updates 2:3.3.16-1ubuntu2.3 amd64 [upgradable from: 2:3.3.16-1ubuntu2.2]

libpulse-mainloop-glib0/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

libpulse0/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

libpulsedsp/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

libpython3.8-minimal/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.2 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]

libpython3.8-stdlib/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.2 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]

libpython3.8/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.2 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]

libqmi-glib5/focal-updates 1.28.6-1~20.04.1 amd64 [upgradable from: 1.24.8-1]

libqmi-proxy/focal-updates 1.28.6-1~20.04.1 amd64 [upgradable from: 1.24.8-1]

libreoffice-common/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libreoffice-pdfimport/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libreoffice-style-breeze/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libreoffice-style-elementary/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libreoffice-style-tango/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libseccomp2/focal-updates,focal-security 2.5.1-1ubuntu1~20.04.2 amd64 [upgradable from: 2.5.1-1ubuntu1~20.04.1]

libssh-4/focal-updates,focal-security 0.9.3-2ubuntu2.2 amd64 [upgradable from: 0.9.3-2ubuntu2.1]

libssl1.1/focal-updates 1.1.1f-1ubuntu2.10 amd64 [upgradable from: 1.1.1f-1ubuntu2.8]

libudisks2-0/focal-updates 2.8.4-1ubuntu2 amd64 [upgradable from: 2.8.4-1ubuntu1]

libuno-cppuhelpergcc3-3/focal-updates,focal-security 1:6.4.7-0ubuntu0.20.04.2 amd64 [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libuno-purpenvhelpergcc3-3/focal-updates,focal-security 1:6.4.7-0ubuntu0.20.04.2 amd64 [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libuno-sal3/focal-updates,focal-security 1:6.4.7-0ubuntu0.20.04.2 amd64 [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libunoloader-java/focal-updates,focal-updates,focal-security,focal-security 1:6.4.7-0ubuntu0.20.04.2 all [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

libwinpr2-2/focal-updates,focal-security 2.2.0+dfsg1-0ubuntu0.20.04.2 amd64 [upgradable from: 2.2.0+dfsg1-0ubuntu0.20.04.1]

libxatracker2/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

linux-base/focal-updates,focal-updates 4.5ubuntu3.7 all [upgradable from: 4.5ubuntu3.6]

linux-firmware/focal-updates,focal-updates 1.187.25 all [upgradable from: 1.187.16]

mesa-vulkan-drivers/focal-updates 21.0.3-0ubuntu0.3~20.04.5 amd64 [upgradable from: 21.0.3-0ubuntu0.3~20.04.1]

modemmanager/focal-updates 1.16.6-2~20.04.1 amd64 [upgradable from: 1.12.8-1]

mutter-common/focal-updates,focal-updates 3.36.9-0ubuntu0.20.04.2 all [upgradable from: 3.36.9-0ubuntu0.20.04.1]

mutter/focal-updates 3.36.9-0ubuntu0.20.04.2 amd64 [upgradable from: 3.36.9-0ubuntu0.20.04.1]

nautilus-data/focal-updates,focal-updates 1:3.36.3-0ubuntu1.20.04.1 all [upgradable from: 1:3.36.3-0ubuntu1]

nautilus/focal-updates 1:3.36.3-0ubuntu1.20.04.1 amd64 [upgradable from: 1:3.36.3-0ubuntu1]

netplan.io/focal-updates 0.103-0ubuntu5~20.04.5 amd64 [upgradable from: 0.102-0ubuntu1~20.04.2]

openssh-client/focal-updates 1:8.2p1-4ubuntu0.4 amd64 [upgradable from: 1:8.2p1-4ubuntu0.3]

openssl/focal-updates 1.1.1f-1ubuntu2.10 amd64 [upgradable from: 1.1.1f-1ubuntu2.8]

procps/focal-updates 2:3.3.16-1ubuntu2.3 amd64 [upgradable from: 2:3.3.16-1ubuntu2.2]

pulseaudio-module-bluetooth/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

pulseaudio-utils/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

pulseaudio/focal-updates 1:13.99.1-1ubuntu3.13 amd64 [upgradable from: 1:13.99.1-1ubuntu3.11]

python-apt-common/focal-updates,focal-updates 2.0.0ubuntu0.20.04.6 all [upgradable from: 2.0.0ubuntu0.20.04.5]

python3-apport/focal-updates,focal-updates,focal-security,focal-security 2.20.11-0ubuntu27.21 all [upgradable from: 2.20.11-0ubuntu27.18]

python3-apt/focal-updates 2.0.0ubuntu0.20.04.6 amd64 [upgradable from: 2.0.0ubuntu0.20.04.5]

python3-commandnotfound/focal-updates,focal-updates 20.04.5 all [upgradable from: 20.04.4]

python3-pil/focal-updates,focal-security 7.0.0-4ubuntu0.5 amd64 [upgradable from: 7.0.0-4ubuntu0.4]

python3-problem-report/focal-updates,focal-updates,focal-security,focal-security 2.20.11-0ubuntu27.21 all [upgradable from: 2.20.11-0ubuntu27.18]

python3-software-properties/focal-updates,focal-updates 0.99.9.8 all [upgradable from: 0.98.9.5]

python3-update-manager/focal-updates,focal-updates 1:20.04.10.9 all [upgradable from: 1:20.04.10.7]

python3.8-minimal/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.2 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]

python3.8/focal-updates,focal-security 3.8.10-0ubuntu1~20.04.2 amd64 [upgradable from: 3.8.10-0ubuntu1~20.04]

rsync/focal-updates 3.1.3-8ubuntu0.1 amd64 [upgradable from: 3.1.3-8]

snapd/focal-updates 2.51.1+20.04ubuntu2 amd64 [upgradable from: 2.49.2+20.04]

software-properties-common/focal-updates,focal-updates 0.99.9.8 all [upgradable from: 0.98.9.5]

software-properties-gtk/focal-updates,focal-updates 0.99.9.8 all [upgradable from: 0.98.9.5]

squashfs-tools/focal-updates,focal-security 1:4.4-1ubuntu0.3 amd64 [upgradable from: 1:4.4-1]

thermald/focal-updates 1.9.1-1ubuntu0.6 amd64 [upgradable from: 1.9.1-1ubuntu0.4]

thunderbird-locale-en-us/focal-updates,focal-updates,focal-security,focal-security 1:78.14.0+build1-0ubuntu0.20.04.2 all [upgradable from: 1:78.11.0+build1-0ubuntu0.20.04.2]

ubuntu-advantage-tools/focal-updates 27.5~20.04.1 amd64 [upgradable from: 27.2.2~20.04.1]

ubuntu-drivers-common/focal-updates 1:0.9.0~0.20.04.4 amd64 [upgradable from: 1:0.9.0~0.20.04.1]

udisks2/focal-updates 2.8.4-1ubuntu2 amd64 [upgradable from: 2.8.4-1ubuntu1]

ufw/focal-updates,focal-updates 0.36-6ubuntu1 all [upgradable from: 0.36-6]

uno-libs-private/focal-updates,focal-security 1:6.4.7-0ubuntu0.20.04.2 amd64 [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

update-manager-core/focal-updates,focal-updates 1:20.04.10.9 all [upgradable from: 1:20.04.10.7]

update-manager/focal-updates,focal-updates 1:20.04.10.9 all [upgradable from: 1:20.04.10.7]

update-notifier-common/focal-updates,focal-updates 3.192.30.10 all [upgradable from: 3.192.30.9]

update-notifier/focal-updates 3.192.30.10 amd64 [upgradable from: 3.192.30.9]

ure/focal-updates,focal-security 1:6.4.7-0ubuntu0.20.04.2 amd64 [upgradable from: 1:6.4.7-0ubuntu0.20.04.1]

wget/focal-updates 1.20.3-1ubuntu2 amd64 [upgradable from: 1.20.3-1ubuntu1]

wireless-regdb/focal-updates,focal-updates,focal-security,focal-security 2021.08.28-0ubuntu1~20.04.1 all [upgradable from: 2021.07.14-0ubuntu1~20.04.1]

xserver-xorg-core/focal-updates,focal-security 2:1.20.13-1ubuntu1~20.04.2 amd64 [upgradable from: 2:1.20.11-1ubuntu1~20.04.2]

xserver-xorg-legacy/focal-updates,focal-security 2:1.20.13-1ubuntu1~20.04.2 amd64 [upgradable from: 2:1.20.11-1ubuntu1~20.04.2]

xwayland/focal-updates,focal-security 2:1.20.13-1ubuntu1~20.04.2 amd64 [upgradable from: 2:1.20.11-1ubuntu1~20.04.2]




For now i prefer not to upgrade the above package and try to rerun the installation








I ran again the below command again



sudo apt-get install tasksel


I am getting the same error


E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 4869 (unattended-upgr)

N: Be aware that removing the lock file is not a solution and may break your system.

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?




If you have the solution. Can you share with me ?



























































































































































































































































































































































































































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