Well, i have the same messages here, but they are only warnings, gnome-app-install opens normally.
Are you sure it's not opening?
Please, run in a terminal:
sudo apt-get update sudo apt-get dist-upgrade
Try again and, if it still closes, paste here the result of command:
apt-cache policy gnome-app-install
Well, i have the same messages here, but they are only warnings, gnome-app-install opens normally.
Are you sure it's not opening?
Please, run in a terminal:
sudo apt-get update
sudo apt-get dist-upgrade
Try again and, if it still closes, paste here the result of command:
apt-cache policy gnome-app-install