I do not know if it will work, but you can try to manually install the Package
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Can't auth against U1 in g-s
Status in gnome-software package in Ubuntu:
Status in gnome-software source package in Xenial:
Status in gnome-software source package in Yakkety:
Authentication using Ubuntu One credentials to install/remove snaps always
fails. This is due to a behaviour change in snapd (no longer accepts login
requests from non-root users). Existing credentials continue to work.
1. Delete any existing credentials by deleting passwords marked
"com.ubuntu.UbuntuOne.GnomeSoftware" using Seahorse.
2. Start GNOME Software
3. Search for a snap (e.g. "moon-buggy")
4. Install Snap
5. Enter Ubuntu One credentials when prompted
Dialog says "Incorrect email or password".
Authentication completes and the snap is installed.
The solution is to use a new D-Bus service (snapd-login-service) and new
library (snapd-glib) to get the Macaroon from snapd. This has some risk of
introducing new bugs. The change is minimised (other snapd code paths
unchanged) and the alternative is login to be impossible.
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