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These are some guides for various use.
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Disk Management

Grow non-LVM ext4 partition

ATTENTION: Please note that the partition to enlarge has to be the last one with the free space after it.

SSH into the VM.

  • run lsblk check if the disk size has changed
  • if not reboot the virtual machine

In the following it is assumed that the partition to enlarge is /dev/sda2

  • change the size of the partition with parted /dev/sda
  • inside of parted run print free and check where the free space after your partition ends
  • run resizepart and follow the instructions; End is the number you checked in the last step
  • quit parted

Now you need to resize the filesystem with resize2fs /dev/sda2.

Error solving

sudo: unable to open ... Read-only file system

source: [https://askubuntu.com/questions/197459/how-to-fix-sudo-unable-to-open-read-only-file-system]

Ususally the filesystem will go into read-only mode whe the system is running and there is a consistency error. To fix it run:

  • sudo fsck -Af -M - check all filesystems If fsck gets stuck after its version banner: fsck from util-linux 2.20.1 you may want to try using the ext4-specific fsck:
  • fsck.ext4 -f /dev/sda1