Unable to add elementaryOS repository its "insecure"
65
What can I do if a repository/PPA does not have a Release file?
93942
How to fix "Failed to download repository information" error while updating?
2704
Ubuntu 20.04 and 20.10, /etc/securetty: No such file or directory
75879
How do I get add-apt-repository to work through a proxy?
7107
How do I enable the source code repositories?
131270
What means "unable to make backup link of /binary before installing new version: No such file or directory"?
152823
PPAs will not install "sudo: add-apt-repository: command not found"
15413
sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
3298
How do I resolve unmet dependencies after adding a PPA?
68295
"bash: syntax error near unexpected token `('" for stable repository set up
139103
Is is possible to skip the confirmation step while adding a repository?
85250
Skipping acquire of configured file 'xxxx' as repository 'xxxx xenial InRelease' doesn't support architecture 'i386'"
2917
Why disabling "Secure Boot" is enforced policy when installing 3rd party modules
145373
Installing dpkg error "requested operation requires superuser privilege"
10069
Are repository lists secure? Is there an HTTPS version?
63320
Ubuntu repository does not have a Release file