I've encountered the same issue upon recent update to the 5.11 kernel with Ubuntu LTS. I restarted, selected the 5.8 kernal and it worked again. I am not sure everyone will work that out and it could be difficult for new starters to trouble shoot from a system which doesn't boot properly.
Considering that there is an incompatobility between the linux-image-5.11 and the nvidia-340 packages, should this be flagged as some sort of incompatibility so the kernel doesn't get updated if the nvidia-340 package is already installed? this way, this update would be skipped until 5.12/5.13 are released if these packages don't require patching.
I've encountered the same issue upon recent update to the 5.11 kernel with Ubuntu LTS. I restarted, selected the 5.8 kernal and it worked again. I am not sure everyone will work that out and it could be difficult for new starters to trouble shoot from a system which doesn't boot properly.
Considering that there is an incompatobility between the linux-image-5.11 and the nvidia-340 packages, should this be flagged as some sort of incompatibility so the kernel doesn't get updated if the nvidia-340 package is already installed? this way, this update would be skipped until 5.12/5.13 are released if these packages don't require patching.