Comment 3 for bug 1055274

It appears that there is an issue communicating with one of your disks:

Sep 24 03:27:25 ubuntu kernel: [ 852.365943] ata2.00: exception Emask 0x10 SAct 0x1 SErr 0x400000 action 0x6 frozen
Sep 24 03:27:25 ubuntu kernel: [ 852.365951] ata2.00: irq_stat 0x08000000, interface fatal error
Sep 24 03:27:25 ubuntu kernel: [ 852.365954] ata2: SError: { Handshk }
Sep 24 03:27:25 ubuntu kernel: [ 852.365958] ata2.00: failed command: WRITE FPDMA QUEUED
Sep 24 03:27:25 ubuntu kernel: [ 852.365963] ata2.00: cmd 61/00:00:3f:5c:13/04:00:00:00:00/40 tag 0 ncq 524288 out
Sep 24 03:27:25 ubuntu kernel: [ 852.365964] res 40/00:00:3f:5c:13/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
Sep 24 03:27:25 ubuntu kernel: [ 852.365967] ata2.00: status: { DRDY }
Sep 24 03:27:25 ubuntu kernel: [ 852.365975] ata2: hard resetting link
Sep 24 03:27:25 ubuntu kernel: [ 852.688058] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
Sep 24 03:27:25 ubuntu ubiquity[5268]: switched to page console_setup
Sep 24 03:27:25 ubuntu kernel: [ 853.268604] ata2.00: configured for UDMA/33
Sep 24 03:27:25 ubuntu kernel: [ 853.268677] ata2: EH complete
Sep 24 03:27:26 ubuntu kernel: [ 853.870070] ata2.00: exception Emask 0x10 SAct 0x3ff SErr 0x400000 action 0x6 frozen
Sep 24 03:27:26 ubuntu kernel: [ 853.870075] ata2.00: irq_stat 0x08000000, interface fatal error
Sep 24 03:27:26 ubuntu kernel: [ 853.870078] ata2: SError: { Handshk }
Sep 24 03:27:26 ubuntu kernel: [ 853.870081] ata2.00: failed command: WRITE FPDMA QUEUED