error update my ubuntu 20.4
 

tyo@tyo-Vostro-3480:~$ sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://deb.playonlinux.com trusty InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 http://ppa.launchpad.net/apandada1/b...troller/ubuntu focal InRelease
Hit:5 http://ppa.launchpad.net/ondrej/php/ubuntu focal InRelease
sh: 1: /usr/lib/cnf-update-db: not found
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi'
E: Sub-process returned an error code

this is already answered for example here: https://askubuntu.com/questions/1074...python-related