How do I fix connection problem in update sources of ubuntu 15.04 vivid?
133
How can I fix a 404 Error when using a PPA or updating my package lists?
34069
Why am I getting authentication errors for packages from an Ubuntu repository?
140893
Error when using apt-get update
122588
Can't connect to ubuntu archive when using apt-get update
53099
How to fix "-5 No address associated with hostname error" while updating?
21184
Running "sudo apt-get update" returns connection errors
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
66744
Apt "Connection failed"
66130
13.10 BCM4313 network problems after update
19361
Can't update because the word prox* is blocked
141807
Rosewill RNX-N600UBE Connectivity issue on Ubuntu 17.04
1520
How to install software or upgrade from an old unsupported release?
12368
A "failed to fetch" error occurs when apt-get update is run. How do I fix this?
148085
how I can fix "AppStream cache update completed, but some metadata was ignored due to errors."?"
5877
"Failed to fetch" while updating
104906
Unable to connect to repository in MiKTeX 2.9
115653
canonical-livepatch, Doesn't seem to patch anything