I performed an upgrade of an Ubuntu 16.04 desktop to Ubuntu 18.04 today
and ran "dpkg -l | grep '^rc'" after purging packages and captured the
difference.
$ diff --new-line-format="" --unchanged-line-format="" xenial-nopurge.txt
xenial-purge.txt
rc gnome-user-share 3.18.3-3
amd64 User level public file sharing via WebDAV
rc initscripts 2.88dsf-59.3ubuntu2
amd64 scripts for initializing and shutting down the system
rc insserv 1.14.0-5ubuntu3
amd64 boot sequence organizer using LSB init.d script
dependency information
rc libhybris
0.1.0+git20151016+6d424c9-0ubuntu7 amd64 Allows to run
bionic-based HW adaptations in glibc systems - libs
rc mountall 2.54ubuntu1
amd64 filesystem mounting tool
rc signond 8.59+17.10.20170606-0ubuntu1
amd64 Single Sign On framework
rc snap-confine 2.32.9+18.04
amd64 Transitional package for snapd
rc suru-icon-theme 16.10+18.04.20180421.1-0ubuntu1
all Ubuntu Suru Icon theme
rc sysv-rc 2.88dsf-59.3ubuntu2
all System-V-like runlevel change mechanism
[ 1:27PM 10767 ] [ bdmurray@impulse:~/tmp/bug-1775660 ]
$ wc -l xenial-nopurge.txt
51 xenial-nopurge.txt
[ 1:29PM 10768 ] [ bdmurray@impulse:~/tmp/bug-1775660 ]
$ wc -l xenial-purge.txt
42 xenial-purge.txt
So this looks good to me for an upgrade from Ubuntu 16.04.
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https://bugs.launchpad.net/bugs/1775660
Title:
ubuntu-release-upgrader should purge obsolete packages, not just
remove them
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