I tested this on Linux Mint 17.2 'Rafaela' Cinnamon 62-bit.
1. Install the package ibus-m17n ![Install ibus-m17n](
2. Select _Keyboard Input Methods_ from the startmenu **or** which starts _ibus-setup_ :
![Keyboard Input Methods in the mnu](
3. Select _sera m17n_ as a new Input Method and press _Add_. Close this dialog.
![Add sera m17n as a new IBus Input Method](
4. Go to _System Settings - > Language -> Input Method_ and check two things here: First input method must be set to **IBus** , secondly see if IBus missing components it offers you to install here. If they are missing install them.
![Check that IBus is the Input Method](
5. Logout, Login or Reboot
6. From now on, pressing Ctrl+Space will switch between all added input methods:
![enter image description here](