Not booting after update - failed to mount UUIDxxxx on real boot

[andreas85]

[HowTo] get Space on BTRFS

If you encounter a situation where a Btrfs volume is out of space, There is a way out However, you have to accept that Btrfs is a “strange” filesystem. So if you’re doing things that would help with other filesystems, it might NOT help with btrfs. If you want to know why, check out the wiki Here are a few simple tips: 1. Only use btrfs to meassure the unallocated space on your filesystem: sudo btrfs filesystem usage / 2. Look at “Device unallocated:” If the Unallocated size is less than 10GB…