Comment 2 for bug 1557612

I'm facing this problem too... But I am unable to install the package, look:

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$ sudo apt install evolution-data-server-online-accounts
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  mir-client-platform-mesa4 mir-graphics-drivers-desktop mir-platform-graphics-mesa-kms8 mir-platform-graphics-mesa-x8 mir-platform-input-evdev5 qtubuntu-desktop
  ubuntu-application-api3-desktop
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  address-book-service address-book-updater buteo-sync-plugins-contacts-google qtcontact5-galera qtdeclarative5-ubuntu-telephony0.1 unity8 unity8-desktop-session-mir
The following NEW packages will be installed:
  evolution-data-server-online-accounts
0 upgraded, 1 newly installed, 7 to remove and 2 not upgraded.
Need to get 33.6 kB of archives.
After this operation, 9,486 kB disk space will be freed.
Do you want to continue? [Y/n] ^C
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 It tries to uninstall Unity8, which I'm experimenting / using now.

 So, what to do?

Thiago