Update to Ubuntu 11.10 Oneiric Ocelot

These days, Ubuntu's new release hit the repositories, so I upgraded my three systems as soon as possible to see if some annoying Unity bugs have been solved finally. Here is the resume and the reasons why I'll evaluate to switch to KDE finally: Upgrade
During the upgrades I had two issues:
  1. Emacs got somehow broken on one system y prevented the upgrade process to finish completely. It even said, the process had been aborted, but the only thing missing was the last Cleanup step.
    I removed emacs packages and reinstalled them, then everything went fine.
  2. Screenblanker got stuck on one of my machines during upgrade, so I could hit on any button to enter the last Cleanup step.
    I connected via Remote Desktop to that machine and could finish the process correctly.
Updating custom repositories
As usual, the upgrade process disables all your custom repositories to prevent problems. You'll have to adapt and enabled them by hand, or you might use these instructions to do this with a few commands.
# Become super-user
sudo -i

# Set some variables (these can be changed to adapt to other Ubuntu versions)
export old=natty
export new=oneiric

# Enter repository list folder
cd /etc/apt/sources.list.d/

# Change old distribution list files and store them as newer ones
for sl in *-${old}.list ; do echo "Creating ${sl/${old}/${new}}" ; sed 's/\(.*\) '${old}'\(.*\)/\1 '${new}'\2/' $sl > ${sl/${old}/${new}} ; done

# Enable and remove the "disabled ..." comment
for sl in *-${new}.list ; do echo "Enabling ${sl}..." ; sed -i.bak 's/^# \(.*\) disabled on upgrade to '${new}'$/\1/' $sl ; done

# Check they are all fine
for sl in *-${new}.list ; do echo "Content of ${sl/${old}/${new}}:" ; cat $sl ; done

# Cleanup backup files and old distribution list files (not needed any longer)
rm *-${old}* *${new}.list.bak

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