the 92GB ext4 Solus gets the /boot flag? how does that work? how do you get away with an all-in-one dealio (sdb2) like that?
and the error code is on the unallocated? I've seen that e2fsck error before it meant nothing to me at the time.
gnome-disks and gparted don't always speak the same language hence yr error
what are you trying to do with the unallocated? why would solus disappear when you format(?) or install on(?) a 400MiB partition? I guess that's your question. but what partiton are you trying to format.
I'm confused. But it's not you. Stuff goes over my head a lot.