@stgraber is there another step I need to do (I’ve tried rebooting)?
root@banana:~# cat /proc/partitions
major minor #blocks name
8 0 97656248 sda
8 1 102400 sda1
8 2 4090863 sda2
8 16 356 sdb
root@banana:~# growpart /dev/sda 2
CHANGED: partition=2 start=206848 old: size=8181727 end=8388575 new: size=195105615 end=195312463
root@banana:~# cat /proc/partitions
major minor #blocks name
8 0 97656248 sda
8 1 102400 sda1
8 2 97552807 sda2
8 16 356 sdb
root@banana:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 3.7G 0 3.7G 0% /dev
tmpfs 741M 696K 740M 1% /run
/dev/sda2 3.8G 839M 2.9G 23% /
tmpfs 3.7G 0 3.7G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 3.7G 0 3.7G 0% /sys/fs/cgroup
/dev/sda1 99M 3.9M 95M 4% /boot/efi
config 94G 7.0M 94G 1% /run/lxd_config/9p