Hi,
  Looking at your logs, it's showing 'medium errors' on your hard drive - i.e. 
the hard drive looks like it's failing - I suggest you check it with a disk 
utility or smartctl; I've never seen 'medium errors' being reported for any 
other type of problem.

Jul 14 17:42:52 ubuntu kernel: [ 1508.592618] ata1.00: exception Emask 0x0 SAct 
0x1 SErr 0x0 action 0x0
Jul 14 17:42:52 ubuntu kernel: [ 1508.592623] ata1.00: irq_stat 0x40000008
Jul 14 17:42:52 ubuntu kernel: [ 1508.592628] ata1.00: failed command: READ 
FPDMA QUEUED
Jul 14 17:42:52 ubuntu kernel: [ 1508.592635] ata1.00: cmd 
60/08:00:c8:79:2a/00:00:04:00:00/40 tag 0 ncq 4096 in
Jul 14 17:42:52 ubuntu kernel: [ 1508.592636]          res 
41/40:08:cd:79:2a/00:00:04:00:00/64 Emask 0x409 (media error) <F>
Jul 14 17:42:52 ubuntu kernel: [ 1508.592640] ata1.00: status: { DRDY ERR }
Jul 14 17:42:52 ubuntu kernel: [ 1508.592643] ata1.00: error: { UNC }
Jul 14 17:42:52 ubuntu kernel: [ 1508.714085] ata1.00: configured for UDMA/100
Jul 14 17:42:52 ubuntu kernel: [ 1508.714098] ata1: EH complete
Jul 14 17:43:53 ubuntu kernel: [ 1569.644551] ata1.00: exception Emask 0x0 SAct 
0x1 SErr 0x0 action 0x0
Jul 14 17:43:53 ubuntu kernel: [ 1569.644556] ata1.00: irq_stat 0x40000008
Jul 14 17:43:53 ubuntu kernel: [ 1569.644561] ata1.00: failed command: READ 
FPDMA QUEUED
Jul 14 17:43:53 ubuntu kernel: [ 1569.644567] ata1.00: cmd 
60/08:00:f0:79:2a/00:00:04:00:00/40 tag 0 ncq 4096 in
Jul 14 17:43:53 ubuntu kernel: [ 1569.644569]          res 
41/40:08:f0:79:2a/00:00:04:00:00/64 Emask 0x409 (media error) <F>
Jul 14 17:43:53 ubuntu kernel: [ 1569.644573] ata1.00: status: { DRDY ERR }
Jul 14 17:43:53 ubuntu kernel: [ 1569.644575] ata1.00: error: { UNC }
Jul 14 17:43:53 ubuntu kernel: [ 1569.646357] ata1.00: configured for UDMA/100

** Changed in: ubiquity (Ubuntu)
       Status: Confirmed => Invalid

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Title:
  I can not install ubuntu

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