I have to say that it is quite a shame that Canonical does not provide a proper solution for this problem, as it has quite a big impact if you cannot update packages with security fixes anymore.
Anyway, I managed to solve the problem. From an earlier repo installation I had a file "isv:ownCloud:desktop.asc" inside
I have to say that it is quite a shame that Canonical does not provide a proper solution for this problem, as it has quite a big impact if you cannot update packages with security fixes anymore.
Anyway, I managed to solve the problem. From an earlier repo installation I had a file "isv:ownCloud: desktop. asc" inside