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This question already has an answer here:

I need more space on my root partition running Ubuntu 17 (using Xfce session).
I do have a lot of unallocated space BEFORE.
However, when I try to resize root partition - /dev/sdb2 , I can't add/remove a MiB...

Is this even possible?

If so, can it somehow be done from the live system or do I have to use live CD/USB?

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There is really just Ubuntu and Xcfe session, LUBUNTU_SYSTEM is just an old label :)

marked as duplicate by user68186, Eric Carvalho, David Foerster, vidarlo, muru Feb 8 '18 at 6:07

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    You cannot resize a mounted partition so you have to use a live session. Then you can first move your / partition to the beginning of your disk and then resize. I would recommend a backup before any operation on the partitions - one never knows ... – muclux Feb 2 '18 at 17:28
  • @muclux will the system and booting remain untouched? :) – jave.web Feb 2 '18 at 18:01
  • Well, as I said, better backup before. But normally all should go well, if you pay attention at what you are doing. Boot from Live DVD/USB, call gparted, move /dev/sdb2 to create an unallocated space behind it, and then resize /dev/sdb2. Don't mount your disk partitions during this operation. – muclux Feb 2 '18 at 18:16
  • @muclux Thank you, booting a linux live USB (Lubuntu Try Mode) and using GParted worked :) ... I think that I have read somewhere that in newer versions you can resize/move even when in the live system - is it impossible in this case because it is not just expanding to the right but also moving to the left? – jave.web Feb 2 '18 at 19:36
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    You can only grow to the right while it is mounted. Moving requires it to be unmounted. BTRFS can even shrink while it is mounted ;) – psusi Feb 2 '18 at 19:37
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A partition can only be resized by modifying its end. Therefore first, you have to move the / partition to the beginning of the drive, gaining some free space after the moved / partition. Then you can grow the / partition which will be done by changing its end block number to a bigger number.

These actions can both be made through GParted, called from a live system on an USB or a DVD, but not from the current system where the partition is currently mounted.

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