Every time I open up Minecraft.jar (I have Linux Ubuntu 10.10), I log in, and then the window disappears completely, with nothing but an error log in my home folder.  Also, Minecraft updates successfully before disappearing if there isn't a .minecraft folder.  Now, I have already tried opening Minecraft with Sun Java Runtime and OpenJDK Runtime, but same result.  I have several packages installed via Synaptic:

-default-jre
-default-jre-headless
-default-jdk
-default-jdk-doc
-gjc-native-helper
-openjdk-6-jre
-openjdk-6-jre-lib
-openjdk-6-jdk
-openjdk-6-doc
-openjdk-6-dbg
-openjdk-6-jre-headless
-icedtea6-plugin
-openjdk-6-jre-zero
-icedtea-6-jre-cacao
-sun-java6-bin
-sun-java6-jre
-sun-java6-source
-sun-java6-jdk
-sun-java6-plugin

I've already reinstalled these many times, and deleted the .minecraft folders, and clients, and got new ones from the website many times.  Im out of ideas, please help!

[example of error log below]

Files: 

hs_err_pid4508.log_.zip