I'm running an Ubuntu server on an old Dell Poweredge 800. After updating it, I'll get several 'System program problem detected' popups on startup. Several seconds later the keyboard and mouse will freeze up then the screen will go blank. I've tried recovering my data using the method outlined here but the main drive doesn't appear under the list of drives. I've gone into recovery mode and verified that the files still exist.
Is there some alternative way to access that drive and if not, what is the next easiest way to recover the data from my drive?
EDIT:
lsblk output:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 153.4G 0 disk
├─sda1 8:1 0 243M 0 part /media/f9b18a81-df67-4629-8ba4-e57698667825
├─sda2 8:2 0 1K 0 part
└─sda5 8:5 0 153.1G 0 part
sdb 8:16 0 74.5G 0 disk
├─sdb1 8:17 0 133.3M 0 part
└─sdb2 8:18 0 74.4G 0 part /media/Data disk
sdc 8:32 0 931.5G 0 disk
├─sdc1 8:33 0 1.6G 0 part
└─sdc2 8:34 0 929.9G 0 part /media/Data disk_
sr0 11:0 1 693.3M 0 rom /cdrom
loop0 7:0 0 663M 1 loop /rofs