Is there a fairly clean way to migrate from Mint (Petra, Cinnamon, 64bit) to Ubuntu (14.04 LTS, Gnome, 64bit) without losing most of my setup and application installs?
FWIW, /var and /home are on separate volumes from /boot and /
I wish there was an easy tool for migrating between distributions, but I don't think anything like that exists.
install aptoncd in Mint :-
sudo apt-get install aptoncd
After taking backup (.ISO) from Mint then install aptoncd on your ubuntu and Restore .ISO file !!