qemu-kvm package definition has changed. Here's the error message
Install libvirt packages
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package qemu-kvm is a virtual package provided by:
qemu-system-x86-hwe 1:10.2.1+ds-1ubuntu4 (= 1:10.2.1+ds-1ubuntu4)
qemu-system-x86 1:10.2.1+ds-1ubuntu3 (= 1:10.2.1+ds-1ubuntu3)
You should explicitly select one to install.
E: Package 'qemu-kvm' has no installation candidate
qemu-kvm package definition has changed. Here's the error message