You seem to have at least one faulty storage device; see all the I/O errors. Don’t be fooled that it’s sdb one time an sdc the other; that could just be the same device, as outlined here. That could also explain your initial issue with the faulty driver installation. You should consider backing up the device and replacing it. Or see if it’s a power supply issue, as @ogra suggested. Or it could just be a loose cable/connector, so best check that first.
(order adjusted for logical grouping)
These commands are for boot performance analysis.
I am not a fan of the legacy dmesg; journalctl is much more powerful and does the same, including the | more – well, | less, technically, b/c more got replaced by less a long time ago – when run like this:
journalctl --boot --dmesg --priority warning
or
journalctl -b -kp warning
for short. But that also limits the output to kernel messages; I wanted to see all messages of priority err or higher, which includes services as well. 