Waou !
Fantastic new possibilities but when I do an apt-clean,
I ended with :
Reading package lists...
W: GPG error: http://shell.ninthgate.se wheezy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0B38CE01521D8275
Don't know if it's part of the problem or how to solve it... but the marked owncloud is still there...
Thanks for your help
EDIT : ok, I got rid of the error message by editting the source.list.d rep, but still having the same problem... I give up.
As I installed the NEXTCLOUD, I don't whant to mix it up and uninstall it now...
Thanks for your help
Alex