Why does Update Manager give me a `Type not known' error with a PPA?
249
How do I fix this "E: Type '*' is not known on line * in source list ..." update error?
8282
Are PPAs safe to add to my system and what are some "red flags" to watch out for?
135452
How do you see what packages are available for update
44613
PPA & Packaging: Having versions of packages for multiple distros
36332
Can a deb package contain a PPA dependency and install packages from the PPA?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
78128
ERROR No package identifier when getting value for resource number
140893
Error when using apt-get update
77827
How do I file a bug on a PPA upstream with the maintainers using Launchpad?
78011
Unable to install package post adding ppa
53099
How to fix "-5 No address associated with hostname error" while updating?
41844
Package Install via Market sometimes fails and gives seemingly random error message
118297
How to find which PPA contains a specific package?
67727
Explicitly accept change for PPA 'Label'
1632
How do I fix a "Failed to download package files" error?
115187
How do I avoid checking for updates for a specific module?
157379
Is there any limit to the number of PPA's I can add to the system? Why?