Just promoted new package with som fixes, if after installing 0.5.8 you still get segfault as root in terminal type "apt-get install libmidgard2-2010" which by latest should make sure your libmidgard2 gets updated to latest version (I just realized I should have said version >=10.05.1 rather than >=10.05, it shouldn't matter for new installs but if you happen to have the older version installed it might not get upgraded).