mark@mark-Aspire-V5-571G:~$ sudo ppa-purge ppa:ricotz/unstable 
Updating packages lists
W: The repository 'http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu yakkety Release' does not have a Release file.
E: Impossibile recuperare http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/dists/yakkety/main/binary-i386/Packages  404  Not Found
E: Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.
Warning:  apt-get update failed for some reason
mark@mark-Aspire-V5-571G:~$