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HOST # wget https://cloud-images.ubuntu.com/bionic/20220518/bionic-server-cloudimg-amd64.img
HOST # cp bionic-server-cloudimg-amd64.img guest.qcow2
HOST # qemu-img resize guest.qcow2 100G
GUEST # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 252:0 0 100G 0 disk
├─vda1 252:1 0 2.1G 0 part /
├─vda14 252:14 0 4M 0 part
└─vda15 252:15 0 106M 0 part /boot/efi
GUEST # growpart /dev/vda 1
CHANGED: partition=1 start=227328 old: size=4384735 end=4612063 new: size=209487839,end=209715167
GUEST# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 252:0 0 100G 0 disk
├─vda1 252:1 0 99.9G 0 part /
├─vda14 252:14 0 4M 0 part
└─vda15 252:15 0 106M 0 part /boot/efi