Those are “loops” like a virtual sections for a snap containers. Interesting is that sda2 is type of ext4. Do you have only 1 HDD in you virtual machine? I assume yes, then seems it is sda. You have to:
- Ensure that you have an up to date backup.
- Ensure that you have an up to date backup.
- Ensure that you have an up to date backup.
- Unmount the filesystem.
- Check the filesystem.
- Resize filesystem.
Not sure if you can simply do it on a root partition, but you can try (this is vm only). MAKE A BACKUP.
Found few tutorials depends on your system: increase size of ext4 at DuckDuckGo