Looks like your USB disk came loose or is damaged:
Oct 3 22:40:19 ubuntu kernel: [ 492.245986] usb 2-4: USB disconnect, device
number 5
Oct 3 22:40:19 ubuntu kernel: [ 492.252474] sd 10:0:0:0: [sdc] Unhandled
error code
Oct 3 22:40:19 ubuntu kernel: [ 492.252477] sd 10:0:0:0: [sdc] Result:
hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Oct 3 22:40:19 ubuntu kernel: [ 492.252481] sd 10:0:0:0: [sdc] CDB:
Write(10): 2a 00 00 15 45 20
Oct 3 22:40:19 ubuntu kernel: [ 492.252486] Buffer I/O error on device sdc1,
logical block 174048
Oct 3 22:40:19 ubuntu kernel: [ 492.252489] 00
Oct 3 22:40:19 ubuntu kernel: [ 492.252490] Buffer I/O error on device sdc1,
logical block 174049
Oct 3 22:40:19 ubuntu kernel: [ 492.252492] 00
Oct 3 22:40:19 ubuntu kernel: [ 492.252493] Buffer I/O error on device sdc1,
logical block 174050
Oct 3 22:40:19 ubuntu kernel: [ 492.252495] f0
Oct 3 22:40:19 ubuntu kernel: [ 492.252496] Buffer I/O error on device sdc1,
logical block 174051
Oct 3 22:40:19 ubuntu kernel: [ 492.252498] 00
Oct 3 22:40:19 ubuntu kernel: [ 492.252499] Buffer I/O error on device sdc1,
logical block 174052
Oct 3 22:40:19 ubuntu kernel: [ 492.252501]
Oct 3 22:40:19 ubuntu kernel: [ 492.252502] Buffer I/O error on device sdc1,
logical block 174053
Oct 3 22:40:19 ubuntu kernel: [ 492.252504] Buffer I/O error on device sdc1,
logical block 174054
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/865700
Title:
Installer crash on external USB disk
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