[Koha] Koha upgrade from 17.11 to 18.05

[SATISH]

Hi,

The same error reported for me on L-Ubuntu 16.04 Desktop today.

I have changed stable to oldstable (ie, 17.11) in
/etc/apt/sources.list.d/koha.list

and this works for installing koha-common successfuly.

Is it with OS Package problem or Package related to current Koha Stable
Version (18.05) ?

With Thanks
Satish MV
Librarian
Govt. Engineering College, Hassan
Karnataka