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user/troubleshooting/vm-troubleshooting.md
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@ -1,6 +1,6 @@
---
layout: doc
title: Suspend/Resume Troubleshooting
title: VM Troubleshooting
permalink: /doc/vm-troubleshooting/
redirect_from:
- /doc/remove-vm-manually/
@ -10,6 +10,8 @@ redirect_from:
## VM Kernel troubleshooting ##
This troubleshoot applies to the non-default kernel choice described in the [Managing VM docs](https://www.qubes-os.org/doc/managing-vm-kernel/#using-kernel-installed-in-the-vm).
In case of problems, you can access the VM console using `qvm-console-dispvm VMNAME` in dom0, then access the GRUB menu.
You need to call it just after starting the VM (until `GRUB_TIMEOUT` expires); for example, in a separate dom0 terminal window.
@ -19,9 +21,9 @@ You can always set the kernel back to some dom0-provided value to fix a VM kerne
## Qubes starts, but no VMs load ##
This issue may occur if a dom0 update is interrupted halfway through and/or a hard power off is done without shutting down Qubes, which results in files getting corrupted.
In this case, the best fix is to reinstall Qubes and restore your files from a backup.
Even if you have not backed up data in a while, you should be able to mount the volumes to pull data from them.
First, try to start a particular VM, check any failure message and direct further steps based on that.
This issue has been seen to occur if a dom0 update is interrupted halfway through and/or a hard power off is done without shutting down Qubes, which results in files getting corrupted.
## Can not uninstall a VM / “ERROR: VM installed by package manager: template-vm-name”
@ -65,6 +67,7 @@ One solution is to add a dummy interface to allow the package to install correct
## "Cannot connect to qrexec agent" error ##
If you face this error when starting a VM, it may be due to too little initial memory.
A solution is to increase the initial memory from 200MB to 400MB by navigating to VM settings » Advanced » Initial memory.
If you face this error when starting a VM, look into the VM logs at `/var/log/xen/console/guest-VMNAME.log`.
Common reasons that may be revealed are: too low memory, corrupted files or a VM crash on startup.
If the error occurs as a result of too little initial memory, increase the initial memory from 200MB to 400MB by navigating to VM settings » Advanced » Initial memory.