You can try to disable the cdrom Zorin 17 repository and psyke83 ppa. Go to the app Software&Updates and disable them.
If you have added other third-party repositories disable them before the upgrade.
Here are some general tips what can help:
You can try to disable the cdrom Zorin 17 repository and psyke83 ppa. Go to the app Software&Updates and disable them.
If you have added other third-party repositories disable them before the upgrade.
Here are some general tips what can help: