The software management suggest to update yum cache, however this does not work either. I tried to remove trail abonnement on the management interface, but on my nethserver installation, the abonnement seems just to have lost its connection. Howe can I remove trail abonnement on my server?
Activating a subscription will enable the stable YUM repositories, but will disable any other repositories you may have added. You can re-enable any other repositories by creating a “template-custom” for /etc/nethserver/eorepo.conf.
or in my case I removed the subscription get access to the regular repros.