Expand the disk in esx
Take a snapshot
sudo su
make it look for the bigger disks
echo "1" > /sys/class/scsi_disk/{your device here}/device/rescan
make sure it's seen the change
lsblk
https://askubuntu.com/questions/24027/how-can-i-resize-an-ext-root-partition-at-runtime
$ sudo fdisk /dev/sda
Command (m for help): p
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 9437183 4717568 83 Linux
Command (m for help): d
Selected partition 1
Command (m for help): p
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4, default 1): 1
First sector (2048-10485759, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-10485759, default 10485759):
Using default value 10485759
Command (m for help): p
Device Boot Start End Blocks Id System
/dev/sda1 2048 10485759 5241856 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
pvresize /dev/sda3
lvextend -r -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
df -h
Delete your snapshot
Crack on with your holiday (because systems always run out of space when you'd like to be away from your computer).