I've omited to give details ! After upgrading from 2.8.4-1 to 2.8.5-1 the printers are nore more visible une hp-toolbox (all printer ere ethernet printers, i've no locale printers) After downgrading from 2.8.5-1 to 2.8.4-1 (dpkg -i from the .deb available une /var/cache/archive/) the printers are OK thans