ola bem parece algo relacionado com seu hd e estou desconfiando que seu hd esta indo pro espaço amigo
de este comando:sudo fdisk -l
e poste o resultado.
ubuntu@ubuntu:~$ sudo fdisk -l
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc157e8fa
Device Boot Start End Blocks Id System
/dev/sda1 * 63 44403659 22201798+ 7 HPFS/NTFS/exFAT
/dev/sda2 296282112 312573951 8145920 7 HPFS/NTFS/exFAT
/dev/sda3 44403784 296270729 125933473 5 Extended
/dev/sda5 95715333 98639099 1461883+ 82 Linux swap / Solaris
/dev/sda6 98639163 296270729 98815783+ 83 Linux
/dev/sda7 44403786 76630049 16113132 83 Linux
Partition table entries are not in disk order
Disk /dev/sdb: 7803 MB, 7803174912 bytes
122 heads, 58 sectors/track, 2153 cylinders, total 15240576 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc3072e18
Device Boot Start End Blocks Id System
/dev/sdb1 * 8064 15240575 7616256 b W95 FAT32