The problem is due to LP: #1918110. A fix for that was released today so you should update and rerun flash-kernel (if it doesn't run automatically).
I don't understand your comment #4. ** Changed in: linux-raspi (Ubuntu Groovy) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi in Ubuntu. https://bugs.launchpad.net/bugs/1922779 Title: vc4 and v3d module not loaded Status in linux-raspi package in Ubuntu: New Status in linux-raspi source package in Groovy: Fix Released Bug description: I am testing ubuntu 21.04 beta on raspberry pi 4 and after installation and also after restart vc4 v3d kernel module isn't loaded So 3d acceleration don't work uname -a Linux misko-desktop 5.11.0-1004-raspi #4-Ubuntu SMP PREEMPT Mon Mar 22 15:51:28 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1922779/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp