I would like to copy a new ringtone to my BQ Aquarius Ubuntu Edition. How can I copy ringtones from /home/phablet/Downloads to usr/share/sounds/ubuntu/ringtones/
Custom ringtones will arrive with OTA-9 (Jan 27 2016).
There is currently no UI to add new ringtones, and the preinstalled ones are stored in a read-only location. Once you are aware of the implications, you can try to set your phone in read-write mode
Further information can be found here.