apt list --upgradable shows there's one upgradable package.
libreoffice-sdbc-firebird/stretch-backports 1:5.4.4-1~bpo9+1 amd64 [upgradable from: 1:4.3.3-2+deb8u7]
However, running apt upgrade does not do the trick.
UPDATE:
apt-cache policy libreoffice-sdbc-firebird:
libreoffice-sdbc-firebird:
Installed: 1:4.3.3-2+deb8u7
Candidate: 1:4.3.3-2+deb8u7
Version table:
*** 1:4.3.3-2+deb8u7 100
100 /var/lib/dpkg/status
Source.list:
#
# deb cdrom:[Debian GNU/Linux 8.3.0 _Stretch_ - Official amd64 DVD Binary-1 20160123-19:03]/ stretch contrib main
# deb cdrom:[Debian GNU/Linux 8.3.0 _Stretch_ - Official amd64 DVD Binary-1 20160123-19:03]/ stretch contrib main
deb http://ftp.uk.debian.org/debian/ stretch main
deb-src http://ftp.uk.debian.org/debian/ stretch main
deb http://security.debian.org/ stretch/updates main contrib
deb-src http://security.debian.org/ stretch/updates main contrib
# stretch-updates, previously known as 'volatile'
deb http://ftp.uk.debian.org/debian/ stretch-updates main contrib
deb-src http://ftp.uk.debian.org/debian/ stretch-updates main contrib
# Debian 8 "Stretch"
deb http://httpredir.debian.org/debian/ stretch main contrib
#
deb [arch=amd64] http://rodeo-deb.yhat.com/ rodeo main
# source for virtualbox backport, not avaialble in stretch
#deb http://ftp.debian.org/debian stretch-backports main contrib
#non free Opera
deb http://deb.opera.com/opera-stable/ stable non-free
cat /etc/apt/sources.listthe package seem to be installed initially from Wheezy backports.deb http://ftp.debian.org/debian stretch-backports main contrib, for virtualbox. I have commented out this line now.apt policy? You should at least have an entry forstretch-backports(well, you would have had before you commented that line out insources.list), and an entry forstretch... Actually it would be useful if you could add the contents of yoursources.listfile to the question.policyis only possible if you no longer have any repositories active insources.list.apt-cache policy libreoffice-sdbc-firebird, notapt-cache policy. But things are running well now.