Can you try the trick described by Zdeněk Janák:
"I had the same problem on ATI Radeon 9200 PRO. Disable Option
EnablePageFlip in Device Section in /etc/X11/xorg.conf fix it. It should
looks like this
Section "Device"
Identifier "Device0"
Driver "radeon"
Option "EnablePageFlip" "off"
EndSection
Or just comment out or remove the line, becose disable is the default
value for radeon driver."
--
Stellarium crashes on startup (ATI Radeon graphics card)
https://bugs.launchpad.net/bugs/481669
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