Raspberry Pi OS • Re: upgrade and no screen on vnc connect

Hi to all ,

i just upgraded my raspberry pi to raspbian bookworm manually .
All seems to be good except now , when i connect with VNC server to it , don' t display the screen .

i got only a black screen within a little window , and say :
" can't display desktop at this moment " . ( or thing like similar to this )
my language is french .

[ ... ]

can you help me to fix this please ?

Networking

During Bullseye, we rolled out the use of the NetworkManager network controller as an option which could be selected in raspi-config. This is now the standard control mechanism for networking in most Linux distributions, and is now the default network controller for Bookworm, replacing the previous system, dhcpcd. NetworkManager does everything dhcpcd did, but adds a bunch of extra functionality, including the ability to connect to hidden wireless networks, to connect to virtual private networks (VPNs), and to use a Raspberry Pi as a wireless hotspot.

We have always said that for a major version upgrade, you should re-image your SD card and start again with a clean image. In the past, we have suggested procedures for updating an existing image to the new version, but always with the caveat that we do not recommend it, and you do this at your own risk.

This time, because the changes to the underlying architecture are so significant, we are not suggesting any procedure for upgrading a Bullseye image to Bookworm; any attempt to do this will almost certainly end up with a non-booting desktop and data loss. The only way to get Bookworm is either to create an SD card using Raspberry Pi Imager, or to download and flash a Bookworm image from here with your tool of choice.

Statistics: Posted by B.Goode — Mon Aug 18, 2025 11:31 am