After upgrading from Ubuntu 18.04 to 18.10 you may have some repositories that have been disabled.
This guide will show you how to re-enable the repositories on your new release to ensure that your applications contiue to recieve updates.
Step 1: Re-enable Repositories
Open the GNOME Launcher and click on Terminal. Type in the below command which will re-enable any repositories that were disabled pre-upgrade:
for f in /etc/apt/sources.list.d/*.list; do sudo sed -i 's/bionic/cosmic/g' $f; sudo sed -i 's/^# \(.*\) # disabled on upgrade to.*/\1/g' $f;done
Step 2: Check for errors
Next, run the below command to check for updates:
sudo apt update
If there are any issues, they will be displayed in the below format:
E: The repository '[http://ppa.launchpad.net/example/project/ubuntu](http://ppa.launchpad.net/example/project/ubuntu) bionic Release' does not have a Release file.
Step 3: No release file
If you see any errors the repository does not support your current release and should be removed.
sudo add-apt-repository --remove ppa:%PPA_Name%/ppa
For example, for the starlabs repositories (which actually do have bionic and cosmic release files):
sudo add-apt-repository --remove ppa:starlabs/ppa
sudo apt upgrade
To re-add the repository:
sudo add-apt-repository ppa:starlabs/ppa
Step 4: Perform application upgrades
To perform any upgrade that is pending post-upgrade from the repositories:
sudo apt update
sudo apt upgrade
Step 5: Further information
For further information on managing repositories please see our Manage PPA guide here.