I got this error trying to install Xubuntu 10.10 on an IBM X40 from a
CD-RW disc. Kubuntu 10.10 worked fine.
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10.10 can't mount squashfs file system
https://bugs.launchpad.net/bugs/636711
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This problem recently appeared on my computer, and I'm pretty sure it was
upgrading xfce4-session from 4.4.3-0ubuntu1~intrepid1 to 4.6.0-1ubuntu2 that
did it.
This also swapped xfce4-mcs-plugins out for xfce4-settings. xfdesktop4 wasn't
touched.
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Multiple instances of xfdesktop started