I had the same problem on Ubuntu 10.10.
Downgraded libfuse2 using "sudo dpkg -i --force-downgrade libfuse2_2.8.4-1ubuntu1_i386.deb", after downloading the .deb from https://launchpad.net/ubuntu/+source/fuse/, so TrueCrypt is working back.
I had the same problem on Ubuntu 10.10.
Downgraded libfuse2 using "sudo dpkg -i --force-downgrade libfuse2_ 2.8.4-1ubuntu1_ i386.deb" , after downloading the .deb from https:/ /launchpad. net/ubuntu/ +source/ fuse/, so TrueCrypt is working back.