Clipboard support broken in Ubuntu 17.10

[Vasya Pupkin]

Mono apps can no longer modify system clipboard. For example, KeePass 2.x (https://keepass.info/). It was working perfect in Ubuntu 17.04.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: mono-complete 4.6.2.7+dfsg-1ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 20 04:13:09 2017
InstallationDate: Installed on 2017-10-19 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: mono
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[pureblood (freeseek)]

Not sure whether this is the same issue. Since I moved to Ubuntu 17.10 I cannot copy and paste from gedit anymore. If I open gedit, write something, and then try to paste it in Firefox it does not work. When I try to paste, I get the following line in the stderr of gedit:

(gedit:#####): Gdk-WARNING **: Error writing selection data: Error writing to file descriptor: Broken pipe

Copying and paste from and among other applications works just fine.

[Sebastien Bacher (seb128)]

is that under wayland sessions only, does it work under x11?

[Vasya Pupkin (shadowlmd)]

I didn't check under x11, and I'm now running Ubuntu 17.04 so I can't check it.