apt-get update isn't able to connect to the internet
1520
How to install software or upgrade from an old unsupported release?
113442
apt-get not working on Ubuntu 16.04, problems with kernel packages
146675
Error 101: Network is unreachable when trying to update
46155
What does apt-get install do under the hood?
95593
sudo apt-get update returns an error
1632
How do I fix a "Failed to download package files" error?
59119
apt-get, unmet dependencies, ... "but it is not going to be installed"
35735
No internet after upgrade to 17.10
28650
`apt-get update` cannot find Ubuntu servers
66744
Apt "Connection failed"
63491
Ubuntu 17.04 connected to wifi but can't browse internet
121462
Fixing a broken packet system (apt-get)
156977
Unable to install files with apt-get: "unable to locate package"
135575
How to fix a "Failed to fetch binary-armhf/Packages" error during apt-get update?
72695
Can't connect to Windows Update
130118
Ubunutu 18.04 Updates 404 error
404
Last upgrade crashes network manager (no internet connection, no applet)