Looks like you have some device errors:
Aug 17 17:25:15 ubuntu kernel: [ 663.442203] ata1.00: exception Emask 0x0 SAct
0x0 SErr 0x0 action 0x0
Aug 17 17:25:15 ubuntu kernel: [ 663.442216] ata1.00: BMDMA stat 0x65
Aug 17 17:25:15 ubuntu kernel: [ 663.442225] ata1.00: failed command: READ DMA
Aug 17 17:25:15 ubuntu kernel: [ 663.442242] ata1.00: cmd
c8/00:08:00:b0:07/00:00:00:00:00/e1 tag 0 dma 4096 in
Aug 17 17:25:15 ubuntu kernel: [ 663.442242] res
51/01:07:01:b0:07/00:00:00:00:00/e1 Emask 0x1 (device error)
Aug 17 17:25:15 ubuntu kernel: [ 663.442251] ata1.00: status: { DRDY ERR }
Aug 17 17:25:15 ubuntu kernel: [ 663.457253] ata1.00: configured for UDMA/100
Aug 17 17:25:15 ubuntu kernel: [ 663.472406] ata1.01: configured for UDMA/33
Aug 17 17:25:15 ubuntu kernel: [ 663.472425] ata1: EH complete
[more in syslog]
(I can't tell if that's your disc or your install device raising
errors.)
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https://bugs.launchpad.net/bugs/1485702
Title:
upgrade CD U14.04 TLS crach
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