The problem with removing Maeflight (assuming you installed it recently - unsure what the situation is if you've installed it while it was working) isn't so much that the uninstall step causes a hang, it's more that it can't find a couple of files during the remove process and returns 1, which makes apt-get or dpkg think that the uninstall failed, and causes it to try to undo the uninstall by rerunning the postinstall script, which causes this issue. Found a workaround for this:

Run this first:

touch /opt/maeflight/.maeflight_tools
touch /opt/maeflight/a.pyc

before running apt-get remove maeflight.

(Side note: The N9 version works under Meecolay, but it has the rotation bug)