How to fix `sudo apt-get update` on Ubuntu 16.04?
133
How can I fix a 404 Error when using a PPA or updating my package lists?
106931
How to undo sudo add-apt-repository?
21795
Apt-get update with an @ in password error
93246
How to resolve conflicting distributions in apt-get
122588
Can't connect to ubuntu archive when using apt-get update
83924
error while trying to sudo apt-get update GPG, no sign repository
24603
apt-get upgrade gives "403 forbidden" error
140893
Error when using apt-get update
65099
Unable to install any updates through update manager/apt-get upgrade
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
158674
How do I get `apt-get update` to work on a machine with no internet access and manually assigned IP address?
27769
Problem with IPv6 sudo apt-get update/upgrade
21184
Running "sudo apt-get update" returns connection errors
66065
"Unable to connect" error with apt-get?
69275
I installed a program by getting its source code, and then running `sudo make install`; how to make `apt-get` know about it?
117623
Why do I need root-privileges to update my package manager's package list?
90937
apt-get update errors