Comment 3 for bug 1769446

Thanks for your report.

Disregard dino99 comment, it is misleading and can lead to potentially dangerous actions. The problem is due to packages that you hold (on purpose?) so the release upgrader refuses to upgrade them to a newer version.

Among them are:
gconf2
gconf-service
gir1.2-gnomekeyring-1.0
gir1.2-rb-3.0
libalgorithm-diff-xs-perl
libclass-c3-xs-perl
libclass-xsaccessor-perl
libclone-perl
libdevel-caller-perl
libdevel-lexalias-perl
libfile-fcntllock-perl
libgconf-2-4
libgnome-keyring0
libio-pty-perl
liblist-moreutils-perl
liblocale-gettext-perl
libnet-dbus-perl
libnih1
libnih-dbus1
libpackage-stash-xs-perl
libpadwalker-perl
libparams-util-perl
libperlio-gzip-perl
libposix-strptime-perl
librhythmbox-core10
libsocket6-perl
libsub-identify-perl
libtext-iconv-perl
libunicode-linebreak-perl
libvte9
libxml-parser-perl
python3-cairo
python3-dbus
python3-netifaces
rhythmbox
rhythmbox-plugins

Unhold them and try an upgrade again. I'm closing this report because it is not a problem with Ubuntu but do not hesitate to file any bug you may find.