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