I would recommend you to reinstall the system, as it is the easiest way to go.
if you don't have the /home
into a separate partition, you should backup your data into another drive. After that, you should be able to install Xubuntu without troubles, and you won't need to follow the next steps I'm giving you.
If the /home
folder is in a separate partition, just start the Xubuntu installer.
When you are asked if you want to delete the disk, select the last option (I don't know how is it labeled in English, maybe More options, Something more or Advanced options) and click on Next.
Select the partition where your actual system is installed and click on Change.
Select ext4
(or what you want) as the filesystem, /
as the mount point and check the Format partition request. Click Accept
Select the /home
partition (use fdisk -l or mount to know what partition is the home. It's usually the largest one in your disk) and click on Change. Select filesystem (you have to choose the actual filesystem of the partition. Again, use fdisk -l
or mount
to know it) and mount point (/home
), but DON'T CHECK the Format drive option. Click on Accept and you are done.
Click on Install, confirm your changes, continue the system configuration, wait for it to be installed, etc.
When your system is fully ready-to-use, backup the sources.list
file, so you won't need to reformat the PC if you face this issue again in the future.
Hope this helps!