lvm

LV resize

lvextend -L+10G /dev/system-zjrak/assets
e2fsck -f /dev/system-zjrak/assets
resize2fs /dev/system-zjrak/assets

use rescue mode and select ubuntu 14.04
connect and use sudo
find the volume group using lvscan (exemple : /dev/system-uwslj/root)
check the disk with
```
e2fsck -fy /dev/system-uwslj/root
```
resize the disk to 4G (only 2G are used by default)
```
resize2fs /dev/system-uwslj/root 4G
```
reduce the lvm volume
```
lvreduce -L 5G /dev/system-uwslj/root
```
resize the partition with the empty space
```
resize2fs /dev/system-uwslj/root
```
disconnect from the rescue mode and restart in normal mode