I am having the same problem just updated my Pi 4 Model B (armv71) to Dietpi v6.29.2 Latest version. I only have a 32GB micro-SD card in it. All storage goes to my NFS mounted NAS.
Installed Sonarr, Deluge, Nzbget changed to static IP and installed open vpn client.
Pi worked fine until Nzbget stopped downloading after about an hour. So I rebooted.
Now I get:
RootFS is currently Read Only (R/O) mounted. Aborting
DietPi requires RootFS to be Read/Write (R/W) mounted. Please run "dietpi-drive_manager" to re-enable.
When I try and run most of the diet-_____ commands. And none of my Softwares are running anymore
I retried the install 3 times and ran into the same error.
When I run dietpi-drive_manager it notices all my mounted drives but i get
cp: cannot create regular file '/etc/fstab': Read-only file system
at the end.
in the dietpi-drive_manager it says
Please select a drive to see available options.
- User data location: RootFS (/mnt/dietpi_userdata)
When I choose the /boot option and select Transfer RootFS
It says [WARNING] Partition must be unmounted, before format and RootFS transfer can begin.
Please unmount the partition, then try again.
I don't know how to fix this, only started happening after the update any help would be appreciated.