I upgraded from Bionic to Cosmic by editing /etc/apt/sources.list
replacing all occurences of bionic by cosmic and then running

sudo apt update
sudo apt dist-upgrade

After some time the error occured and I cleaned up with

sudo apt install -f

and completed the upgrade with another

sudo apt dist-upgrade

which this time completed without errors.

In the end I did

sudo apt autoremove

to finish up.

So the error occured only once and after cleaning up I could complete
the upgrade.

You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to wayland in Ubuntu.

  package libwayland-dev 1.15.0-2 failed to install/upgrade: trying to
  overwrite '/usr/lib/x86_64-linux-gnu/pkgconfig/wayland-egl.pc', which
  is also in package libegl1-mesa-dev:amd64 18.0.5-0ubuntu0~18.04.1

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