All good on Bionic too:
:~$ apt-cache policy nvidia-prime nvidia-prime: Installed: 0.8.16~0.18.04.1 Candidate: 0.8.16~0.18.04.1 Version table: *** 0.8.16~0.18.04.1 500 500 http://it.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 500 http://it.archive.ubuntu.com/ubuntu bionic-proposed/main i386 Packages 100 /var/lib/dpkg/status 0.8.8.2 500 500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages 0.8.8 500 500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 500 http://it.archive.ubuntu.com/ubuntu bionic/main i386 Packages
:~$ apt-cache policy nvidia-settings nvidia-settings: Installed: 460.39-0ubuntu0.18.04.2 Candidate: 460.39-0ubuntu0.18.04.2 Version table: *** 460.39-0ubuntu0.18.04.2 500 500 http://it.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages 100 /var/lib/dpkg/status 440.82-0ubuntu0.18.04.1 500 500 http://it.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 390.42-0ubuntu1 500 500 http://it.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
All good on Bionic too:
:~$ apt-cache policy nvidia-prime it.archive. ubuntu. com/ubuntu bionic- proposed/ main amd64 Packages it.archive. ubuntu. com/ubuntu bionic- proposed/ main i386 Packages dpkg/status it.archive. ubuntu. com/ubuntu bionic-updates/main amd64 Packages it.archive. ubuntu. com/ubuntu bionic-updates/main i386 Packages it.archive. ubuntu. com/ubuntu bionic/main amd64 Packages it.archive. ubuntu. com/ubuntu bionic/main i386 Packages
nvidia-prime:
Installed: 0.8.16~0.18.04.1
Candidate: 0.8.16~0.18.04.1
Version table:
*** 0.8.16~0.18.04.1 500
500 http://
500 http://
100 /var/lib/
0.8.8.2 500
500 http://
500 http://
0.8.8 500
500 http://
500 http://
:~$ apt-cache policy nvidia-settings 0ubuntu0. 18.04.2 0ubuntu0. 18.04.2 0ubuntu0. 18.04.2 500 it.archive. ubuntu. com/ubuntu bionic- proposed/ main amd64 Packages dpkg/status 82-0ubuntu0. 18.04.1 500 it.archive. ubuntu. com/ubuntu bionic-updates/main amd64 Packages 42-0ubuntu1 500 it.archive. ubuntu. com/ubuntu bionic/main amd64 Packages
nvidia-settings:
Installed: 460.39-
Candidate: 460.39-
Version table:
*** 460.39-
500 http://
100 /var/lib/
440.
500 http://
390.
500 http://