Hello Devin
Sorry if disturb, can you please look that in your /var/log/dmesg don't 
appearing lines like these:

[ 1545.350121] ata3.00: irq_stat 0x40000008
[ 1545.350132] ata3.00: failed command: READ FPDMA QUEUED
[ 1545.350152] ata3.00: cmd 60/60:00:a8:0a:80/00:00:0c:00:00/40 tag 0 ncq 49152 
in
[ 1545.350156]          res 51/40:60:a8:0a:80/00:00:0c:00:00/40 Emask 0x409 
(media error) <F>
[ 1545.350165] ata3.00: status: { DRDY ERR }
[ 1545.350171] ata3.00: error: { UNC }
[ 1545.351721] ata3.00: SB600 AHCI: limiting to 255 sectors per cmd
[ 1545.353706] ata3.00: SB600 AHCI: limiting to 255 sectors per cmd
[ 1545.353715] ata3.00: configured for UDMA/133
[ 1545.353743] ata3: EH complete

Simply open the file with gedit and search for 'EH complete' and refere if it 
appears again.
For the other notebook i suggest you to post on ask.ubuntu.com or here in 
Launchpad clicking on the tab Answer in the top of the page.

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https://bugs.launchpad.net/bugs/700450

Title:
  package btrfs-tools 0.19 20100601-3 failed to install/upgrade: unable
  to delete control info file `/target/var/lib/dpkg/info/btrfs-
  tools.md5sums': Read-only file system

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