Thank you for taking the time to report this bug and helping to make
Ubuntu better. Reviewing your dmesg attachment in this bug report it
seems that there is a problem with your hardware. I recommend
performing a back up and then investigating the situation. Measures you
might take include
By the way you may also have hardware errors:
[ 312.837872] ata1.00: failed command: READ FPDMA QUEUED
[ 312.837891] ata1.00: cmd 60/08:e8:70:20:80/00:00:0f:00:00/40 tag 29 ncq 4096
in
res 41/04:00:38:20:80/00:00:0f:00:00/40 Emask 0x1
(device error)
[ 312.837901]