>From dmesg-2:
[  535.243216] end_request: I/O error, dev sda, sector 38039071
[  535.248144] Aborting journal on device sda1:8.
[  535.265712] EXT4-fs error (device sda1): ext4_journal_start_sb: Detected 
aborted journal
[  535.265727] EXT4-fs (sda1): Remounting filesystem read-only

dmesg-3:
[  997.211783] end_request: I/O error, dev sda, sector 38032023

Looks like the drive has some trouble starting sector 38032023 despite smart 
saying it has 0 bad sectors.
That ext3 is not affected may be just luck. ext3 does no happen to have 
important data there.

You could use
badblocks /dev/sda1
to verify that it's bad blocks that are causing trouble.

The ubuntu installer does not check for bad blocks when formattiing. If
you want to use this drive, i think you will have to manually format
(mkfs.ext4 -cc /dev/sda1) and then tell the installer to use the
existing file system.

-- 
Unable to install using ext4
https://bugs.launchpad.net/bugs/512002
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