Copy and paste between remote sessions using Remmina

I too am experiencing this in Ubuntu 15.04, for now, all I can do is direct you to the bug I reported: https://bugs.launchpad.net/ubuntu/+source/remmina/+bug/1439478

Update: I ultimately solved this by installing a newer version this way:

sudo apt-add-repository ppa:remmina-ppa-team/remmina-next ; sudo apt-get update ; sudo apt-get install remmina remmina-plugin-rdp

After doing this, it may require a reboot.

It's not a solution, but if you don't have time to install anything, reboot, or investigate what's going on:

Close session, restart Remmina and open session again.

It worked for me.

Ok, I was reading the README in the new source code. I got to the line were it says: install dependencies:

$ sudo apt-get install cmake intltool   libgtk-3-dev libssh-dev libavahi-ui-gtk3-dev libvte-2.90-dev libxkbfile-dev 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
cmake is already the newest version.

Suggested packages:
  autoconf2.13 autoconf-archive gnu-standards autoconf-doc libtool
  libgtk-3-doc libssh-doc
The following NEW packages will be installed:
  autoconf automake autotools-dev intltool libatk-bridge2.0-dev
  libavahi-client-dev libavahi-common-dev libavahi-glib-dev libavahi-ui-gtk3-0
  libavahi-ui-gtk3-dev libdbus-1-dev libgtk-3-dev libssh-dev libssl-dev
  libssl-doc libvte-2.90-dev libvte-2.90-doc libwayland-dev libxkbcommon-dev
  libxkbfile-dev
0 upgraded, 20 newly installed, 0 to remove and 0 not upgraded.
Need to get 4,839 kB of archives.
After this operation, 28.4 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y

Once I installed that, I tested the old version I am currently using, Remmina 0.9.99.1 runs, (as it did) but copy paste functionality has resumed.

The source for version 1 still failed to compile, that's a bummer, but as long as i can copy and paste in a relatively new version, I'm ok with this solution. Try it if you like.