read previous post again
Try the appimage
EDIT: or...Keep the flatpack Gimp 2.10.8 The default Gimp for 'buntu 18.04 is Gimp 2.8.22 Install that along side the flatpack. They co-exist, I know, I use that set-up in (k)ubuntu 16.04
Install gmic_gimp_qt for Gimp 2.8
Quote:...Are you using a flatpack (or snap)? These are sandboxed and have no QT support - gmic_gimp_qt will not work...
Try the appimage
EDIT: or...Keep the flatpack Gimp 2.10.8 The default Gimp for 'buntu 18.04 is Gimp 2.8.22 Install that along side the flatpack. They co-exist, I know, I use that set-up in (k)ubuntu 16.04
Install gmic_gimp_qt for Gimp 2.8