Ubuntu desktop installation problem, a lot of error messages

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http://askubuntu.com – I am getting error messages while trying to install ubuntu 12.04 on my desktop (Intel Pentium D). The error messages are: *checking battery state... [412.633532] end_request:I/O error .dev sr0, sector 1291684 [435.997503] SQUASHFS error: squashfs_readdata failed to readbloack 0x275fcda4 [435.9975xx] SQUASHFS error: unable to read fragment cache entry page [275fcda4] ... [524.000055] exception Emask 0x0 SAct 0x0SErr 0x0 action 0x6 frozen ata5.00 : cmd a0/00:00:00:08:00/00:00:00/00 tag0 pio 16392 in res 58 /00:02:00:08:00/00/a0 Emask 0xf(timeout) [524.000292] ata5.00 status : {DRDY DRQ} I wa (HowTos)