I have an MSI GL73-8RD with an SSD and an HDD. I installed windows on the SSD with some files stored in the HDD, then partitioned the HDD and installed Ubuntu 18.04 there.
Later on, Ubuntu was upgraded to 20.04. I just had to click a prompt. Apparently this resulted in 20.04 being installed alongside 18.04, but for some reason I can’t use my password on the 18.04 installation anymore.
Moreover, after a windows update, 20.04 would only launch in emergency mode. I checked several gotchas and then found in the logs that there was an issue with the partition /dev/sda7. I ran fsck on this partition, and now 20.04 won’t boot even in recovery mode. Windows 10 and 18.04 still start fine however.
There are important files I need to recover from the failed Ubuntu install. I think the hardware is fine, so the files should still be there.
I booted on a live USB stick and tried to mount the partitions in read_only. Because my installation is very dirty, there are two windows related partitions which work fine, a location named “Computer” and three unnamed volumes, /dev/sda4-5-7.
I tried to mount them, unfortunately the one that seems to contain my data is /dev/sda7 and it cannot be mounted.