Also, root on btrfs.
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https://bugs.launchpad.net/bugs/1636034
Title:
Kernel panic - not syncing: VFS: Unable to mount root fs
Status in linux package in Ubuntu:
Confirmed
Bug description:
Got kernel panic at boot and could not reach grub using shift. Found
Bug #1547559, saw this comment by Jason Straight.
"Stumbled across this today while searching for a fix for a PC running
16.04 that this is happening on. I don't understand why, but editing
/etc/default/grub to uncomment the line for graphical terminal fixed
it. What that has to do with mounting root I don't know, but that was
certainly the fix."
"Uncommenting #GRUB_TERMINAL=console fixed it."
Yes, it does. Not sure if this is related or not so new bug.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-45-generic 4.4.0-45.66
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: gilsr 2587 F.... pulseaudio
/dev/snd/controlC1: gilsr 2587 F.... pulseaudio
/dev/snd/controlC0: gilsr 2587 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun Oct 23 19:53:47 2016
HibernationDevice: RESUME=UUID=6b783c22-05f6-4b87-8d0b-5f23d003361b
InstallationDate: Installed on 2016-10-08 (15 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
IwConfig:
lo no wireless extensions.
eno1 no wireless extensions.
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.4.0-45-generic
root=UUID=b69ab98a-b1e4-4612-a1b2-1cfb9f742265 ro rootflags=subvol=@ quiet
splash
RelatedPackageVersions:
linux-restricted-modules-4.4.0-45-generic N/A
linux-backports-modules-4.4.0-45-generic N/A
linux-firmware 1.157.4
RfKill:
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/01/2012
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BHZ7710H.86A.0094.2012.1101.1115
dmi.board.name: DZ77BH-55K
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG39008-400
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnIntelCorp.:bvrBHZ7710H.86A.0094.2012.1101.1115:bd11/01/2012:svn:pn:pvr:rvnIntelCorporation:rnDZ77BH-55K:rvrAAG39008-400:cvn:ct3:cvr:
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