OK, this question shows how to install Truecrypt on Linux. But how to configure it correctly in Ubuntu 14.04, so it works fine:
a normal user should be able to mount a truecrypt volume without the need to enter an administrator's password, his own password should be sufficient
make the by default created icon (
/usr/share/applications/truecrypt) work (by default the GUI launches, but one gets "Permission denied" errors even when just exiting; prepending "pkexec" the command in the Exec line does not help)
Currently, I have to execute sudo truecrypt in a terminal. After mounting this opens the volume in a new "Files" window (though the according truecrypt option is unselected) which I always have to close. If you make the error to click the Exit button, truecrypt keeps running but without any window. Then you have to open another terminal and run sudo truecrypt again.
