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It keeps appearing this red signal in the top right of my screen with this error. If I run sudo apt update all I got is:

Hit:1 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu bionic InRelease
Hit:2 http://archive.ubuntu.com/ubuntu bionic 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

Thanks.

Tiago Mateus
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1 Answers1

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This should help you fix your problem. Please check, if ls -la /usr/bin/python is pointing to python 2.x or 3.x first.

BulletBob
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  • it points to 2.7 and runned sudo apt-get -f install but then happens the same... – Tiago Mateus Mar 22 '20 at 11:01
  • now I think it goes beyond this. python may be totally broken because I cant open any software or update program without saying that it is misses something ou there no such file or directory... neither terminal. i'm using xterm – Tiago Mateus Mar 22 '20 at 12:13