"Disk Utility" does not show me UUIDs 
  => run command "sudo blkid"
The partition numbering is also suspect. 
  => not so sure, I presume sda4 is an extended partition and sda5 is a logical 
partition
       it's common to name extended partition as sda4 to put it on end of four 
entries table
Please try to reinstall Grub, with following link: 
https://help.ubuntu.com/community/Grub2#Reinstalling%20from%20LiveCD
It could (I said could)  fix your issue.

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Ubuntu 10.04 won't boot after updates
https://bugs.launchpad.net/bugs/668152
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