upgrade to 13.04 from 12.10 without quantal repo
1520
How to install software or upgrade from an old unsupported release?
11556
Can I smoothly upgrade from one LTS to next LTS release?
59088
How to upgrade to a newer release of Ubuntu using the Live CD?
151605
upgrading from 15.10 to 16.04 apt not installed
43279
Alternative Method to Acquire El Capitan Upgrade
109539
How can I perform an offline upgrade using Ubiquity on the installation disc?
38590
How do I suppress the "New release '12.10' available" message?
25957
How do I apt-get -y dist-upgrade without a grub config prompt?
19288
Update manager doesn't offer an upgrade to the new release
85250
Skipping acquire of configured file 'xxxx' as repository 'xxxx xenial InRelease' doesn't support architecture 'i386'"
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
131474
How to only install updates from a specific repository?
122693
How can I upgrade Mac OS without the administrator password?
158462
Repo source for firmware-linux-nonfree?
12578
How do I upgrade to a newer version of Ubuntu?
27076
How to see package version without install?
24165
Upgrade to version newer than repositories