In host, run:
qemu-img info <image>
Inside guest, run:
df -h
and for partition, run:
lsblk
In host, run:
qemu-img resize <image> +5G
+5G indicates increasing 5GB disk image. You can adjust the size as needed.
In Debian guest, run:
sudo apt update
sudo apt install parted e2fsprogs -y
sudo parted /dev/sda
In (parted), run:
print
fix
resizepart 1 100%
quit
and then in Debian guest run:
sudo resize2fs /dev/sda1
In Debian guest, run:
sudo apt update
sudo apt install parted e2fsprogs -y
sudo parted /dev/vda
In (parted), run:
print
fix
resizepart 1 100%
quit
and then in Debian guest run:
sudo resize2fs /dev/vda1