When trying to add a new printer in CUPS using the web interface, the following appeared in kern.log : Dec 8 16:43:44 willy kernel: [1573111.715393] usb[23237]: segfault at bffd1000 ip b7e404c3 sp bffcde48 error 4 in libc-2.10.2.so[b7dcb000+141000] Hopes it will help.