Repairing Ubuntu filesystem with e2fsck - How to unmout it first?

After running fsck -nf /dev/vda1 I see that there are errors to be fixed, but I can’t run e2fsck -vf /dev/vda while the disk is mounted.
I also can’t boot into the recovery kernel via the control panel because it says The kernel for this Droplet is managed internally and cannot be changed from the control panel.

How to proceed?

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Please open a ticket with our team. They can boot your droplet into a recovery environment from which you can run filesystem checks and repairs without mounting the disk.