Volla Quintus, Volla OS 15 Quintus.
I had Ubuntu Touch installed as a secondary OS with ~110 GB allocated. After an OTA update the Ubuntu boot entry disappeared. Android Storage now shows ~110 GB as “Temporary system file”.
I already:
* reinstalled Ubuntu and removed it again through Boot Manager → Remove OS
* cleared Boot Manager app data (`pm clear org.andbootmgr.app`)
* rebooted
* trimmed caches
* checked logical partitions (`lpdump`) → no Ubuntu partition shown
* checked `/data` → no large visible files
* tested actual writable space by creating a large file → storage stops at the amount Android reports as free, so the missing 110 GB is genuinely unavailable
This looks like an orphaned secondary-OS storage reservation after an OTA update. Is there a maintenance command or recovery procedure to remove the stale reserved Ubuntu allocation on Quintus / Volla OS 15?