I have been using Jessie for a few months now, and I had a problem booting my computer a few weeks ago.I had this error on boot:early console in decompress_kernelDecompressing Linux... Parsing ELF... done.Booting the kernel.Loading, please wait...fsck from utils-linux 2.25.2/dev/mapper/fabienm-root: clean, 12578/262144 files, 179719/1048576 blocksGave up waiting for /usr device. Common problems:- Boot args (cat /proc/cmdline)  - Check rootdelay= (did the system wait long enough?)- Missing modules (cat /proc/modules; ls /dev)ALERT! /dev/mapper/fabienm-usr does not exist. Dropping to a shell!modprobe: module ehci-orion not found in modules.depBusyBox v1.22.1 (Debian 1:1.22.0-9+deb8u1) built-in shell (ash)Enter 'help' for a list of built-in commands./bin/sh: can't access tty; job control turned off(initramfs)If I select the 3.16-2-amd64 kernel in Grub, that boots correctly? and produces this log:early console in decompress_kernelDecompressing Linux... Parsing ELF... done.Booting the kernel.[    0.000000] tsc: Fast TSC calibration failedLoading, please wait...[    6.300000] systemd-fsck[173]: /dev/mapper/fabienm-root: clean, 12578/262144 files, 179719/1048576 blocks[    8.700000] [drm:cpt_set_fifo_inderrun_reporting] ERROR uncleared pch fifo underrun on pch transcoder A[    8.700000] [drm:cpt_serr_int_handler] ERROR PCH transcoder A FIFO underrun[    9.000000] systemd-fsck[432]: /dev/sdb1: clean, xxx/xxx files, xxx/xxx blocks[   11.200000] systemd-fsck[553]: /dev/mapper/fabienm-var: clean, xxx/xxx files, xxx/xxx blocks[   11.600000] systemd-fsck[560]: /dev/mapper/fabienm-home: clean, xxx/xxx files, xxx/xxx blocks[   11.700000] systemd-fsck[564]: /dev/mapper/fabienm-usr: clean, xxx/xxx files, xxx/xxx blocks[   11.900000] systemd-fsck[578]: /dev/mapper/fabienm-tmp: clean, xxx/xxx files, xxx/xxx blocks[FAILED] Failed to start LSB: VirtualBox Linux kernel module.see 'systemctl status virtualbox.service' for details.[  OK  ] Started LSB: Start or stop the inetd deamon..[  OK  ] Started LSB: KernelNFS server support....Once I booted with this working kernel, I can look at /proc/cmdline:$ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-3.16-2-amd64 root=/dev/mapper/fabienm-root ro quietThis kernel works well with all Debian packages except for Virtualbox, which requires 3.16.0-4-amd64 kernel to work.Does someone has a clue how to enable the 3.16.0-4-amd64 kernel to boot on Jessie?[edit]On initramfr (kernel 3.16.0-4-amd64) I launched somes commands :(initramfs) grep dm_mod /proc/modulesdm_mod 89373 4 - live 0xFFFFFFFFA023E000And in /dev/mapper I only see fabienm-root partition :(initramfs) ls -l /dev/mapper/total 0crw------- 1 0 0 10, 236 Mar 25 12:39 controllrwxrwxrwx 1 0 0       7 Mar 25 12:39 fabienm-root -> ../dm-0Under booted linux (3.16-2-amd64) I have:$ ls -l /dev/mapper/total 0crw------- 1 root root 10, 236 mars  25 13:44 controllrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-home -> ../dm-5lrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-root -> ../dm-0lrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-swap_1 -> ../dm-3lrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-tmp -> ../dm-4lrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-usr -> ../dm-1lrwxrwxrwx 1 root root       7 mars  25 13:44 fabienm-var -> ../dm-2and :$ grep dm_mod /proc/modulesdm_mod 89373 20 - Live 0xffffffffa021f000
Jessie: can't boot the kernel 3.16.0-4-amd64
debian;boot;lvm