Debian VM, display is not clear with VNC

[ertank]

Hello,

I just tried to install a Debian 10.6 VM. When I run it and switch to VNC for setup, I see below screen

This screen is not clear at all, but I can actually use VM running. If I press down arrow, I can see white part (which is actually an installation option) moves down.

I just cannot understand what problem is.

I have another VM CentOS 7 that I did not have such problem with it. Both VM systems have identical settings other than their names.
Debian 10.6:

Code:

Virtual CPUs: 1
Cores: 1
Threads: 1
Memory Size: 1.00 GiB
Boot Loader Type: UEFI
System Clock: LOCAL
VNC Port: 9725
Com Port: /dev/nmdm2B
Description: Pi-hole
Shutdown Timeout: 90 seconds

CentOS 7.8:

Code:

Virtual CPUs: 1
Cores: 1
Threads: 1
Memory Size: 1.00 GiB
Boot Loader Type: UEFI
System Clock: LOCAL
VNC Port: 5900
Com Port: /dev/nmdm1B
Description:
Shutdown Timeout: 90 seconds

Any help is appreciated.

 

[HannesM]

that's an know issue by VNC ;)
set graphic resolution to 800x600 and restart the VM.
> Devices > VNC

 

[ertank]

How can I do that resolution change? I think I could not find it.

 

[HannesM]

1. Click on Devices to see all connected devices to your VM.
2. one of the devices is called "VNC".
3. click on the 3 points to the right of the label.
4. Select option "Edit" to edit the VNC config
5. Change "Resolution" vom 1024x768 to 800x600

For changing the config - the system must be powered off.

Good luck

Be carefull with Debian, cause after the installation you had to copy the boot loader to get the VM up without and installation source

 

[ertank]

Be carefull with Debian, cause after the installation you had to copy the boot loader to get the VM up without and installation source

Would you elaborate that, please?

 

[ertank]

Found this thread about UEFI boot problems of Debian

[HOWTO] How-to Boot Linux VMs using UEFI

There have been a number of threads were people have failed to boot a Linux VM after the installation phase using the webUI of FreeNAS 11 nightly, finding themselves stuck in the EFI shell and not knowing how to proceed nor how to avoid this happening each time their VM is started. It has been...

www.truenas.com

Helped a lot.

 

[HannesM]

FreeNAS can not find the EFI information at boot time, this must be changed once as follows.
The actions must be done under the SU (Superuser). The standard SSH user has no rights!

I've done the following with root access to fix it and it works on Debian 10.x without any further activities:

# mkdir -p /boot/efi/EFI/BOOT
# cp /boot/efi/EFI/debian/grubx64.efi /boot/efi/EFI/BOOT/bootx64.efi

Now you can remove the ISO and reboot the Debain VM without any issues

Sorry for delay, but migrating data on my TrueNAS to new datasets in the backgroud