qubes-doc/troubleshooting/uefi-troubleshooting.md
2016-05-18 21:51:02 +08:00

50 lines
2.2 KiB
Markdown

---
layout: doc
title: UEFI Troubleshooting
permalink: /doc/uefi-troubleshooting/
---
Troubleshooting UEFI related problems
========================================
Cannot start installation, hangs at four penguins after choosing "Test media and install Qubes OS" in GRUB menu
---------------------
There is some [common bug in UEFI implementation](http://xen.markmail.org/message/f6lx2ab4o2fch35r), affecting mostly Lenovo systems, but probably some others too. You can try existing workaround:
1. In GRUB menu<sup id="a1-1">[1](#f1)</sup> press `e`.
2. At the end of `chainloader` line add `/mapbs /noexitboot`.
3. Perform installation normally, but not reboot system at the end yet.
4. Go to `tty2` (Ctrl-Alt-F2).
5. Execute `mount | grep boot/efi` and note device name (first column). It should be something like `/dev/sda1`.
6. Execute `efibootmgr -v`, search for `Qubes` entry and note its number (it should be something like `Boot0001` - `0001` is an entry number).
7. Replace existing `Qubes` entry with modified one. Replace `XXXX` with entry number from previous step, `/dev/sda` with your disk name and `-p 1` with `/boot/efi` partition number):
efibootmgr -b XXXX -B
efibootmgr -v -c -u -L Qubes -l /EFI/qubes/xen.efi -d /dev/sda -p 1 "placeholder /mapbs /noexitboot"
8. Compare new entry with the old one (printed in step 6) - it should only differ in additional options at the end.
9. Now you can reboot the system by issuing `reboot` command.
System crash/restart when booting installer
-------------------------------------------
Some Dell systems and probably others have [another bug in UEFI firmware](http://markmail.org/message/amw5336otwhdxi76). And there is another workaround for it:
1. In GRUB menu<sup id="a1-2">[1](#f1)</sup> press `e`.
2. At the end of `chainloader` line add `-- efi=attr=uc`.
3. Perform installation normally, but not reboot system at the end yet.
4. Go to `tty2` (Ctrl-Alt-F2).
5. Execute:
sed -i -e 's/^options=.*/\0 efi=attr=uc' /mnt/sysimage/boot/efi/qubes/xen.cfg
6. Now you can reboot the system by issuing `reboot` command.
* * *
<b name="f1">1</b> If you use rEFInd, you can see 3 options regarding the USB installer. Choose "Fallback Boot Loader" to enter the GRUB menu. [](#a1-1) [](#a1-2)