...make a database dump * cd /var/www * cp -R HaCi HaCi-backup * tar zxvf HaCi_0.961.tar.gz * ...check ownership of files (logs and spool must be writable bywww-data or whatever your apache runs as, HaCi.conf musts be readable by www-data) * diff -ubr HaCi-backup HaCi * ...edit back the changes you had done (typically: add back your CSS layout definition to internal.conf) * restart apache (remember mod_perl is cached!) done!