khafra@ubuntu:~$ ls -l /usr/bin/firefox
lrwxrwxrwx  1 root root 20 2006-03-02 23:07 /usr/bin/firefox -> /opt/firefox/firefox
khafra@ubuntu:~$ firefox
bash: firefox: command not found
khafra@ubuntu:~$ /usr/bin/firefox
bash: /usr/bin/firefox: No such file or directory
khafra@ubuntu:~$ wtf?