Apt-get update and sources.list
1520
How to install software or upgrade from an old unsupported release?
64123
How to list packages from a ppa/source in command line?
108510
apt-get update very slow, stuck at "Waiting for headers"
91491
How can I get "delta" packages to optimize apt-get upgrade downloads?
24368
How can I list all files which have been installed by an APT package?
18288
What is the difference between apt and apt-get?
131490
How do I save Updates/Installed Packages?
38795
How does APT work (apt-get, cache, search)
90937
apt-get update errors
155198
What is the difference between the "jessie" and "jessie-updates" distributions in /etc/apt/sources.list?
72082
Is using Software Updater the same thing as running apt-get update and apt-get upgrade?
23275
What is the correct output of cat /etc/apt/sources.list?
73749
How to find manually installed packages?
66915
How to request a package upgrade in the next Ubuntu release
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
13107
How to install updates via command line?
57980
"Software" and "OS Updates"available in Ubuntu Software