VM Kernel troubleshooting
This troubleshoot applies to the non-default kernel choice described in the Managing VM docs.
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.
In any case you can later access the VM’s logs (especially the VM console log
You can always set the kernel back to some dom0-provided value to fix a VM kernel installation.
Qubes starts, but no VMs load
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”
All of the following commands should be executed in a dom0 terminal.
When a template is marked as ‘installed by package manager’, but cannot be uninstalled there, trying to uninstall manually will result in the error “ERROR: VM installed by package manager: template-vm-name”. Do as follows to be able to uninstall the template:
Check the state of
$ qvm-prefs template-vm-name
installed_by_rpm - True], mark the template as not installed by package manager
$ qvm-prefs template-vm-name installed_by_rpm false
Re-check the state of
installed_by_rpm - False, remove the template like you would a regular qube:
$ qvm-remove template-vm-name
True, reboot your computer to bring qubes.xml in sync with qubesd, and try again to remove the template.
Fixing package installation errors
By default, templates in 4.0 only have a loopback interface.
Some packages will throw an error on installation in this situation. For example, Samba expects to be configured using a network interface post installation.
One solution is to add a dummy interface to allow the package to install correctly:
ip link add d0 type dummy ip addr add 192.168.0.1/24 dev d0 ip link set d0 up
“Cannot connect to qrexec agent” error
If you face this error when starting a VM, look into the VM logs at
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.
“No match found” when trying to install a TemplateVM
[user@dom0 ~]$ sudo qubes-dom0-update --enablerepo=qubes-templates-itl qubes-template-debian-10 Using sys-whonix as UpdateVM to download updates for Dom0; this may take some time... No Match for argument qubes-template-debian-10 Nothing to download
This normally means you already have the template installed.
It may be that you have the matching package installed, but you removed or renamed the template.
rpm -q qubes-template-<name>.
If it lists the package, but you don’t really have the template present (
qvm-ls doesn’t list it), you need to clean up leftovers of the package with
rpm -e --noscripts qubes-template-<name>, then install it normally.