Actually the thing I wanted to test was an upgrade from Xenial to Bionic with the dist-upgrader from -proposed. I've done that now and we can see the following messages in /var/log/dist-upgrade/main.log:
2019-01-23 13:53:38,179 DEBUG entry 'deb-src http://ubuntu.osuosl.org/ubuntu bionic-security main restricted universe multiverse' updated to new dist 2019-01-23 13:53:38,180 DEBUG examining: 'deb http://ppa.launchpad.net/bryce/builds/ubuntu xenial main' 2019-01-23 13:53:38,180 DEBUG verifySourcesListEntry: deb http://ppa.launchpad.net/bryce/builds/ubuntu bionic main 2019-01-23 13:53:38,181 DEBUG url_downloadable: http://ppa.launchpad.net/bryce/builds/ubuntu/dists/bionic/Release 2019-01-23 13:53:38,181 DEBUG s='http' n='ppa.launchpad.net' p='/bryce/builds/ubuntu/dists/bionic/Release' q='' f='' 2019-01-23 13:53:38,489 DEBUG error from httplib: 'HTTP Error 404: Not Found' 2019-01-23 13:53:38,490 DEBUG entry '# deb http://ppa.launchpad.net/bryce/builds/ubuntu xenial main' was disabled (no Release file)
I had to use a different PPA since xbmc one exists for Bionic and Xenial.
Actually the thing I wanted to test was an upgrade from Xenial to Bionic with the dist-upgrader from -proposed. I've done that now and we can see the following messages in /var/log/ dist-upgrade/ main.log:
2019-01-23 13:53:38,179 DEBUG entry 'deb-src http:// ubuntu. osuosl. org/ubuntu bionic-security main restricted universe multiverse' updated to new dist ppa.launchpad. net/bryce/ builds/ ubuntu xenial main' stEntry: deb http:// ppa.launchpad. net/bryce/ builds/ ubuntu bionic main ppa.launchpad. net/bryce/ builds/ ubuntu/ dists/bionic/ Release launchpad. net' p='/bryce/ builds/ ubuntu/ dists/bionic/ Release' q='' f='' ppa.launchpad. net/bryce/ builds/ ubuntu xenial main' was disabled (no Release file)
2019-01-23 13:53:38,180 DEBUG examining: 'deb http://
2019-01-23 13:53:38,180 DEBUG verifySourcesLi
2019-01-23 13:53:38,181 DEBUG url_downloadable: http://
2019-01-23 13:53:38,181 DEBUG s='http' n='ppa.
2019-01-23 13:53:38,489 DEBUG error from httplib: 'HTTP Error 404: Not Found'
2019-01-23 13:53:38,490 DEBUG entry '# deb http://
I had to use a different PPA since xbmc one exists for Bionic and Xenial.