virtual linux ubuntu 20 - how to increase / root partition

problem:
not enough space in: /dev/mapper/ubuntu--vg-ubuntu--lv

solution:
1) increase harddrive in hosting environment (for example in vmware)
2) boot virtual linux system
3) cfdisk > resize partition
4) resize pvs: pvresize /dev/sda3
5) extend logical volume: lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
6) finaly resize filesystem: resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
7) check with: df -h


see also:
- https://kb.vander.host/operating-systems/how-to-resize-an-ubuntu-18-04-lvm-disk/
- https://packetpushers.net/ubuntu-extend-your-default-lvm-space/

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