Ok here fatso. It's possible that the issue might be caused by a system update or a package conflict. Here are some steps that you can try to resolve the issue:

1. Restart the system: Sometimes, an issue can be resolved with a simple restart of the system. Save any unsaved work and restart the computer.

2. Clear the cache: Packages are stored in the cache, and it's possible that the package that's causing the issue is in the cache. To clear the cache, open the terminal and type `sudo apt-get clean` and hit enter.

3. Fix broken packages: It's possible that the issue is caused by broken packages. To fix this, open the terminal and type `sudo apt-get update` followed by `sudo apt-get upgrade`. This should update any packages that need updating and fix any broken packages.

4. Remove conflicting packages: If you installed a package that conflicts with another package, it can prevent you from installing new packages. To remove the conflicting package, open the terminal and type `sudo apt-get remove PACKAGE-NAME`.

5. Reinstall Xubuntu: If all else fails, you can try reinstalling Xubuntu. Make sure to back up any important data before doing this.

I hope this helps! If you have any further questions or concerns, feel free to ask fatso.