Problem:
While trying to update Nextcloud using the command line (e.g., SSH) using a command like

php updater/updater.phar

You can see the following error message:

Nextcloud Updater - version: v26.0.0beta2-9-g64e2e4c dirty

Step 5 is currently in process. Please call this command later.

Solution:
No matter if the step that appears to be currently in progress is Step 3, Step 5, or any other step, the solution is always the same: Reset the update by deleting the data/updater-oc[random-string] folder.

Recommended: If you are paranoid about losing data, rename the directory:

mv data/updater-oc* ../DELETEME-updater

Not recommended: You can also delete the directory

rm -rf data/updater-oc*

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