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67 lines
2.9 KiB
Markdown
67 lines
2.9 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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01. In GRUB menu<sup id="a1-1">[1](#f1)</sup>, select "Troubleshoot", then "Boot from device", then press `e`.
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02. At the end of `chainloader` line add `/mapbs /noexitboot`.
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03. Perform installation normally, but not reboot system at the end yet.
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04. Go to `tty2` (Ctrl-Alt-F2).
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05. Enable `/mapbs /noexitboot` on just installed system. This step differs between Qubes releases:
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**For Qubes 3.1:**
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06. Execute `mount | grep boot/efi` and note device name (first column). It should be something like `/dev/sda1`.
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07. 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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08. 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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09. 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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10. Now you can reboot the system by issuing `reboot` command.
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**For Qubes 3.2 or later:**
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11. Edit `/mnt/sysimage/boot/efi/EFI/qubes/xen.cfg` (you can use `vi` editor) and add to every kernel section:
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mapbs=1
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noexitboot=1
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**Note:** You must add these parameters on two separate new lines (one
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paramater on each line) at the end of each section that includes a kernel
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line (i.e., all sections except the first one, since it doesn't have a
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kernel line).
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12. 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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