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My questions is does Debian propose a package supporting Ethernet card Broadcom BCM57785 ?
For device support during and after Debian installation, you would need to use an unofficial installer (containing a backported Linux kernel) at this time, see [1] for further details.
For an established system (with an alternate form of connectivity), you can use either a backported linux-image package from Debian Backports [2], or a linux-image package proposed for the 6.0.3 point release [3].
Geoff
[1] http://kmuto.jp/debian/d-i/ [2] http://backports-master.debian.org/Instructions/ [3] http://www.debian.org/releases/proposed-updates
SOLVED. I used [1] to grab an unofficial image.It works on my laptop as it includes indeed Broadcom driver needed for Internet connection via Ethernet (for this netinst installation procedure).
Thnaks for your support. Bye, Bruno