It seems that a problem appears in somewhere in upgrade processings in dash. The procedure reproduced 100% by the hand is as follows.
It is in the clean state about firefox: apt-get --purge remove firefox apt-get install firefox=1.5.dfsg-4 /bin/sh is changed into dash: dpkg-reconfigure dash upgrades to 1.5.dfsg+1.5.0.1-1: apt-get install firefox=1.5.dfsg+1.5.0.1-1 And firefox is run: firefox -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]