[Koha] Cannot upgrade Koha on Ubuntu: unmet dependencies

[Rubeno Fernández]

El dilluns, 5 de febrer de 2018, a les 14:26:29 CET, vau escriure:
> Supported versions of Koha don't support Ubuntu 14.04. That's (I guess)
> your problem.

Doh! So simple! And now I found it here:
https://wiki.koha-community.org/wiki/Debian

However, that looks like user-contributed info. I wish every release would 
include it in its notes, because I can't find it there:
https://koha-community.org/koha-17-05-08-release/
Is it because of Perl 5.10? I've got 5.18.2, though.

What are the pitfalls to look for when upgrading to Ubuntu 16.04? Has the 
issue with MySQL 5.7 been sorted out?

Ruben