Tag Archives: virtualbox

VirtualBox/KVM: Reduce VM sizes

There are two utilities that can help discard unused blocks so that VMs can be shrunk. zerofree finds unused blocks with non-zero content in ext2, ext3 and ext4 filesystems and fills them with zeros. The volume can’ be mounted which makes the process of running it a bit convoluted. fstrim will discard unused blocks on… Read More »

Ubuntu 20.4: Virtualbox not running after the last upgrade

When launching a VM in Virtualbox I got an error saying that it can’t be started because a required module isn’t loaded. It suggests to manually load it. Re-installing Virtualbox also fails because the virtualbox-dkms package can’t be configured The last system update upgraded the kernel from 5.4 to 5.8, and there is something in… Read More »

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