Actually, i'm usging linux-image-4.3.0-amd64 on Dell XPS 13 9350. In order to fix WiFi problem i would install linux-image-4.4.0rc4 but it makes it impossible to boot my laptop. I have this message before Luks ask passphrase : Loading, please wait... modprobe: module microcode not found in modules.dep lvmetad is not active yet, using direct activation during sysinit volume group "vg" not found Cannot process volume group vg /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. Reading all physical volumes. This may take a while... /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. Reading all physical volumes. This may take a while... /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. Reading all physical volumes. This may take a while... /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. Reading all physical volumes. This may take a while... /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. Reading all physical volumes. This may take a while... /run/lvm/lvmetad.socket: connect failed: No such file or directory WARNING: Failed to connect to lvmetad. Falling back to internal scanning. I have the same problem with Rc5 & Rc6 - Debian Jessie - dell XPS 9350 (december 2015, professionnal version, no developer version)