

It was exactly as you said; a difference I didn’t know about. Also confirming that Kubuntu apparently installs them system-side, even if flatpak install ... is called without sudo, again as you inferred. I don’t know how I managed to install them user-side in one laptop, but now they mirror each other :)
For others interested, these two commands show the difference, as explained by another user in a cross-post:
flatpak --user list
flatpak --system list
Thank you!
















A reminder also to boycott, as much as possible, those thirteen major publishers – most or all of which are stealing from academia:
APRESS MEDIA, LLC; CENGAGE LEARNING, INC.; ELSEVIER INC.; HACHETTE BOOK GROUP, INC.; HARPERCOLLINS PUBLISHERS LLC; JOHN WILEY & SONS, INC.; MCGRAW HILL LLC; BEDFORD, FREEMAN & WORTH PUBLISHING GROUP, LLC D/B/A MACMILLAN LEARNING; MACMILLAN PUBLISHING GROUP, LLC; PEARSON EDUCATION, INC.; PENGUIN RANDOM HOUSE LLC; SIMON AND SCHUSTER, LLC; AND TAYLOR & FRANCIS GROUP LLC