[Koha] painful upgrade from 2.25 to 3.0.1: incomplete tables

[Frederic Demians]

> but at this point, my installation is totally broken, isn't it? 

I can't say. But yes, you may have to restore a backup and redo the 
whole process.

> if (C4::Context->preference("Version") < TransformToNum($DBversion)) {
> in what file C4::Context gets Version?

DB table: systempreferences
select value from systempreferences where variable='Version'

--
Frédéric