The log is full of this kind of thing:

Mar 23 17:46:57 ubuntu kernel: [  179.202683] sr 0:0:0:0: [sr0] Unhandled sense 
code
Mar 23 17:46:57 ubuntu kernel: [  179.202691] sr 0:0:0:0: [sr0]  Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Mar 23 17:46:57 ubuntu kernel: [  179.202699] sr 0:0:0:0: [sr0]  Sense Key : 
Medium Error [current] 
Mar 23 17:46:57 ubuntu kernel: [  179.202709] Info fld=0x41035
Mar 23 17:46:57 ubuntu kernel: [  179.202713] sr 0:0:0:0: [sr0]  Add. Sense: 
Unrecovered read error
Mar 23 17:46:57 ubuntu kernel: [  179.202723] sr 0:0:0:0: [sr0] CDB: Read(10): 
28 00 00 04 10 30 00 00 08 00
Mar 23 17:46:57 ubuntu kernel: [  179.202742] end_request: I/O error, dev sr0, 
sector 1065172
Mar 23 17:46:57 ubuntu kernel: [  179.202749] quiet_error: 1 callbacks 
suppressed
Mar 23 17:46:57 ubuntu kernel: [  179.202755] Buffer I/O error on device sr0, 
logical block 266293
Mar 23 17:46:57 ubuntu kernel: [  179.202762] Buffer I/O error on device sr0, 
logical block 266294
Mar 23 17:46:57 ubuntu kernel: [  179.202768] Buffer I/O error on device sr0, 
logical block 266295
Mar 23 17:46:59 ubuntu kernel: [  180.750755] sr 0:0:0:0: [sr0] Unhandled sense 
code
Mar 23 17:46:59 ubuntu kernel: [  180.750760] sr 0:0:0:0: [sr0]  Result: 
hostbyte=DID_OK driverbyte=DRIVER_SENSE
Mar 23 17:46:59 ubuntu kernel: [  180.750765] sr 0:0:0:0: [sr0]  Sense Key : 
Medium Error [current] 
Mar 23 17:46:59 ubuntu kernel: [  180.750771] Info fld=0x41035
Mar 23 17:46:59 ubuntu kernel: [  180.750774] sr 0:0:0:0: [sr0]  Add. Sense: 
Unrecovered read error
Mar 23 17:46:59 ubuntu kernel: [  180.750780] sr 0:0:0:0: [sr0] CDB: Read(10): 
28 00 00 04 10 35 00 00 01 00
Mar 23 17:46:59 ubuntu kernel: [  180.750794] end_request: I/O error, dev sr0, 
sector 1065172
Mar 23 17:46:59 ubuntu kernel: [  180.750800] Buffer I/O error on device sr0, 
logical block 266293
Mar 23 17:46:59 ubuntu kernel: [  180.750874] SQUASHFS error: 
squashfs_read_data failed to read block 0x1cd1e6df
Mar 23 17:46:59 ubuntu kernel: [  180.750881] SQUASHFS error: Unable to read 
fragment cache entry [1cd1e6df]
Mar 23 17:46:59 ubuntu kernel: [  180.750892] SQUASHFS error: Unable to read 
page, block 1cd1e6df, size bdcd

This indicates that there's been a problem reading from the CD.  This is
generally due to a faulty CD/DVD disk or drive, rather than being an
installer bug as such.  It may help to clean the CD/DVD, to burn the
CD/DVD at a lower speed, or to clean the CD/DVD drive lens (cleaning
kits are often available from electronics suppliers).

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

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https://bugs.launchpad.net/bugs/741232

Title:
  hard crash installing Kubuntu desktop i386 20110321

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