It appears as though your hard drive is failing:
Oct 25 21:40:56 ubuntu kernel: [14996.772071] sd 0:0:0:0: [sda] Unhandled sense
code
Oct 25 21:40:56 ubuntu kernel: [14996.772074] sd 0:0:0:0: [sda] Result:
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 25 21:40:56 ubuntu kernel: [14996.772079] sd 0:0:0:0: [sda] Sense Key :
Medium Error [current] [descriptor]
Oct 25 21:40:56 ubuntu kernel: [14996.772084] Descriptor sense data with sense
descriptors (in hex):
Oct 25 21:40:56 ubuntu kernel: [14996.772087] 72 03 11 04 00 00 00 0c
00 0a 80 00 00 00 00 00
Oct 25 21:40:56 ubuntu kernel: [14996.772099] 00 00 00 01
Oct 25 21:40:56 ubuntu kernel: [14996.772104] sd 0:0:0:0: [sda] Add. Sense:
Unrecovered read error - auto reallocate failed
Oct 25 21:40:56 ubuntu kernel: [14996.772111] end_request: I/O error, dev sda,
sector 1
Oct 25 21:40:56 ubuntu kernel: [14996.772116] Buffer I/O error on device sda,
logical block 0
If upon replacing the failing drive you are still encountering this
issue, please feel free to reopen this bug or file a new one.
** Changed in: ubiquity (Ubuntu)
Status: New => Invalid
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Installer Crash "grub-install (hd0)"
https://bugs.launchpad.net/bugs/460855
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