I have installed
ubuntu snappy but I can't find
apt-get which is not a problem but I can't find some packages as
vim... Which is the best
Ubuntu version to install ? What are the pros and cons ?
These are the choices I'm aware of for the Pi 2:
Snappy, which is specialized and uses a read-only filesystem.
A normative Ubuntu 14.04 LTS with PPA's for pi specific stuff.
A Mate based 15.04 distro pointed out by Steve.
Using any Ubuntu ARMv7 distro and adapting it appropriately (that talks about Fedora, but the methodology is the same for any GNU/Linux system). Since these are mostly likely LTS releases, there's not much point in this in light of #2.