If you were fast on a trigger and upgraded to Fedora 25 as soon as it was available and you use Owncloud client for your syncing needs you may found yourself that Owncloud client doesn’t start. You may have also noticed an that it causes an error while trying to perform an upgrade to newest release. Error that I got while wanting to start up client was:

owncloud: error while loading shared libraries: libqt5keychain.so.1: cannot open shared object file: No such file or directory

As with every new release Fedora 25 comes with new sets of libraries which broke owncloud client. To fix this error I have just symlinked old library it expects to the current one with:

ln -s /usr/lib64/libqt5keychain.so.0.6.2 /usr/lib64/libqt5keychain.so.1

It is not clear to me if Fedora for some reason has older library version now or what (0.6.2 looks older to me than .1). So until new version is available or owncloud publishes Fedora 25 repository compiled with correct library versions this resolves the issue.