I used

sudo apt-get update
sudo apt-get upgrade

before I read https://www.debian.org/security/2019/dsa-4371 Is there a way to check if my PC got exploited/hacked/virused ?

closed as too broad by Rui F Ribeiro, Michael Homer, Kusalananda, Mr Shunz, Thomas Jan 25 at 10:43

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • Make a note of all packages installed, and compare the checksum of the locally-installed package file to the checksum of a copy of the package in a known-good repository. – DopeGhoti Jan 24 at 20:23
  • @DopeGhoti Is there a guide, article or documentation where I can read how to do this ? – nox Jan 24 at 20:31
  • try running chkrootkit – FabioM Jan 24 at 21:27
  • Suggestion : install apparmor from debian stretch backports. That'll save you from being possible victim of future security flaw. – Kushagra Karira Jan 25 at 12:21