For people which encounter same problem, here a detailed howto to
temporarily repare your distro :
# from initramfs'hell :
# mount correctly your rootfs
mount /dev/mapper/vgname-lvname /root
# and the bootfs
mount /dev/sda1 /root/boot
# then chroot into rootfs
chroot /root /bin/bash
# create a clean directory then go into
mkdir /plop; cd plop
# uncompress an initrd
gunzip < /boot/initrd.img-2.6.38-8-generic | cpio -idmv
# edit the "local" script (which mount local file system)
vim scripts/local
# comment the line 91
> mount ${roflag} ${FSTYPE:+-t ${FSTYPE} }${ROOTFLAGS} ${ROOT} ${rootmnt}
# then hardcode your device
> mount ${roflag} ${FSTYPE:+-t ${FSTYPE} }${ROOTFLAGS}
> /dev/mapper/vgname-lvname ${rootmnt}
# close your favorite editor and build a new initramfs
find . | cpio -ov -H newc | gzip > /boot/initrd.img-rescue
# add a grub custom entry into /boot/grub/custom.cfg
# coppying an actual entry from /boot/grub/grub.cfg
vim /boot/grub/grub.cfg /boot/grub/custom.cfg
# mine looks like this :
> menuentry 'rescue' --class ubuntu --class gnu-linux --class gnu --class os {
> recordfail
> set gfxpayload=$linux_gfx_mode
> insmod part_msdos
> insmod ext2
> set root='(hd0,msdos1)'
> search --no-floppy --fs-uuid --set=root
> uuiduuid-uuid-uuid-uuid-uuiduuiduuid
> linux /vmlinuz-2.6.38-8-generic root=/dev/mapper/vgname-lvname ro
> quiet splash vt.handoff=7
> initrd /initrd.img-rescue
> }
# then... reboot, and to next boot, choose "rescue" in grub menu.
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https://bugs.launchpad.net/bugs/772270
Title:
initramfs uses bad lvm lvname to mount /
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