Am I unsecure after adding untrusted PPA and installing software from it?
8282
Are PPAs safe to add to my system and what are some "red flags" to watch out for?
5342
How can I check if a package is installed (no superuser privileges)?
39582
Difference between "ppa-purge" and "add-apt-repository -r"?
56051
How do you protect your software from illegal distribution?
24308
InstallHandler runs under a special ghost user. What rights does it have?
157482
When installing I'm given the option of encrypting my home folder -- what does this do?
153810
"Untrusted packages could compromise your system's security" appears while trying to install anything
34069
Why am I getting authentication errors for packages from an Ubuntu repository?
18875
Which Ubuntu repositories are totally safe and free from malware?
36772
Is it possible to only allow specific packages updates from a PPA
3298
How do I resolve unmet dependencies after adding a PPA?
134192
How to make sure I'm not using any proprietary software after installation?
92320
Are Snap and Flatpak apps safe to install? Are they "official", approved or tested for a particular distro version?
7371
What are PPAs and how do I use them?
8052
How can I check the integrity of a downloaded Ubuntu CD?
78011
Unable to install package post adding ppa
38595
Are Ubuntu packages security audited?