The problem
Can't load Ubuntu: Superblock checksum does not match superblock while trying to open /dev/sda7
Solution:
In that case it is alarming about /dev/sda7
so we need to fix it:
sudo e2fsck -f -b 32768 -y /dev/sda7
Replace /dev/sda7
wtih your partition, is totally normal get a bunch of numbers scrolling in your screen (something like matrix)
If you get a screen like that, saying Filesystem was modified
, then your filesystem was with problems and it was probably fixed
That's all, if you get the same problem with others partitions then just repeat the process
Invalid argument
it's because you need to change the magic blocker to the right number for example 8193
instead of 32768