Can't apt update on Ubuntu 14.04
133
How can I fix a 404 Error when using a PPA or updating my package lists?
13107
How to install updates via command line?
122588
Can't connect to ubuntu archive when using apt-get update
145400
Error when trying sudo apt-get update - Python related?
114246
apt-get update, unlinking
156977
Unable to install files with apt-get: "unable to locate package"
115722
Apt sources.list problem , packages not found?
95210
APT wedged by kernel version mismatch
16578
How to upgrade a single package using apt-get?
95593
sudo apt-get update returns an error
77705
Unable to upgrade in ubuntu
1520
How to install software or upgrade from an old unsupported release?
109624
How do I tell apt to never upgrade a particular package?
54998
What does "apt-get install !!" do and how to make it work?
83216
apt get update missing release file
108510
apt-get update very slow, stuck at "Waiting for headers"
91491
How can I get "delta" packages to optimize apt-get upgrade downloads?