Comment 14 for bug 1953610

Focal verification
root@verify-lp1953610-focal:~# ### Verification
root@verify-lp1953610-focal:~# # Install updated command-not-found from -proposed
root@verify-lp1953610-focal:~# # https://wiki.ubuntu.com/Testing/EnableProposed
root@verify-lp1953610-focal:~# # Update command-not-found.
root@verify-lp1953610-focal:~# apt install command-not-found

root@verify-lp1953610-focal:~# # Verify version
root@verify-lp1953610-focal:~# dpkg -l | grep command-not-found
ii command-not-found 20.04.6 all Suggest installation of packages in interactive bash sessions
ii python3-commandnotfound 20.04.6 all Python 3 bindings for command-not-found.
root@verify-lp1953610-focal:~# # Force rebuild of DB
root@verify-lp1953610-focal:~# rm -rf /var/lib/command-not-found/*
root@verify-lp1953610-focal:~# apt update
Hit:1 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-proposed InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
root@verify-lp1953610-focal:~# ls -lah /var/lib/command-not-found/
total 3.2M
drwxr-xr-x 1 root root 62 Mar 10 19:14 .
drwxr-xr-x 1 root root 584 Mar 10 19:13 ..
-rw-r--r-- 1 root root 3.2M Mar 10 19:14 commands.db
-rw-r--r-- 1 root root 3.9K Mar 10 19:14 commands.db.metadata
root@verify-lp1953610-focal:~# # Verify success
root@verify-lp1953610-focal:~# su - ubuntu
ubuntu@verify-lp1953610-focal:~$ lck
WARNING:root:could not open file '/etc/apt/sources.list.d/ubuntu-focal-proposed.list'

Command 'lck' not found, did you mean:

  command 'ack' from deb ack (3.3.1-1)
  command 'ick' from deb intercal (30:0.30-3)
  command 'lcf' from deb ucf (3.0038+nmu1)
  command 'ck' from deb python3-ck (1.9.4-1.1)
  command 'lc' from deb mono-devel (6.8.0.105+dfsg-2)
  command 'lcp' from deb lsh-client (2.1-12build3)

Try: apt install <deb name>

ubuntu@verify-lp1953610-focal:~$ ack
WARNING:root:could not open file '/etc/apt/sources.list.d/ubuntu-focal-proposed.list'

Command 'ack' not found, but can be installed with:

apt install ack
Please ask your administrator.

ubuntu@verify-lp1953610-focal:~$ exit
logout
root@verify-lp1953610-focal:~# ## END Verification