In this particular case I had to add a swap partition to existing Ubuntu system.
Shrink LVM
df -h umount /var/www/owncloud/data resize2fs /dev/mapper/vg0-owncloud 15G lvresize -L 15G /dev/mapper/vg0-owncloud lvdisplay /dev/mapper/vg0-owncloud e2fsck /dev/mapper/vg0-owncloud mount -a mount df -h
create new LVM (swap)
# vgdisplay --- Volume group --- VG Name vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 1 Act PV 1 VG Size 20.00 GiB PE Size 4.00 MiB Total PE 5119 Alloc PE / Size 3840 / 15.00 GiB Free PE / Size 1279 / 5.00 GiB VG UUID q6lkE0-H33z-fWX6-5l4H-Kidx-iLKf-NdZJYq
Note Free PE and then
lvcreate vg0 -l 1279 -n swap mkswap -f /dev/mapper/vg0-swap echo "/dev/mapper/vg0-swap none swap sw 0 0" >> /etc/fstab swapon /dev/mapper/vg0-swap
Check with say “free -m” to see if new swap space is now being seen by kernel.