Hi, Thanks for your help! :) I thought so, too, but I still doesn’t work. In detail, I changed my `/etc/apt/sources.list` to:
> ## Note, this file is written by cloud-init on first boot of an instance > ## modifications made here will not survive a re-bundle. > ## if you wish to make changes you can: > ## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg > ## or do the same in user-data > ## b.) add sources in /etc/apt/sources.list.d > ## c.) make changes to template file > /etc/cloud/templates/sources.list.debian.tmpl > ### > > # See > http://www.debian.org/releases/stable/i386/release-notes/ch-upgrading.html > # for how to upgrade to newer versions of the distribution. > deb http://deb.debian.org/debian stretch main contrib non-free > deb-src http://deb.debian.org/debian stretch main contrib non-free > > ## Major bug fix updates produced after the final release of the > ## distribution. > deb http://security.debian.org/ stretch/updates main contrib non-free > deb-src http://security.debian.org/ stretch/updates main contrib non-free > deb http://deb.debian.org/debian stretch-updates main contrib non-free > deb-src http://deb.debian.org/debian stretch-updates main contrib non-free > > ## Uncomment the following two lines to add software from the 'backports' > ## repository. > ## > ## N.B. software from this repository may not have been tested as > ## extensively as that contained in the main release, although it includes > ## newer versions of some applications which may provide useful features. > deb http://deb.debian.org/debian stretch-backports main contrib non-free > deb-src http://deb.debian.org/debian stretch-backports main contrib non-free Then I tried to execute `sudo apt update` and `sudo apt install mailman3-full`; the result is the same: > The following packages have unmet dependencies: > mailman3-full : Depends: mailman3 but it is not going to be installed > Depends: mailman3-web (>= 0+20180916-1) but it is not going > to be installed > Depends: python3-mailman-hyperkitty but it is not going to > be installed > E: Unable to correct problems, you have held broken packages. Best, Keno > Am 14.02.2019 um 09:19 schrieb Pierre-Elliott Bécue <p...@debian.org>: > > Hi. > > mailman3 is not part of stretch but stretch-backports. > > Your sources.list has stretch-backports commented out. > > Please,uncomment the backports lines, run an aptitude update and try again > installing mailman3-full > > Best regards. > -- > PEB from my phone.
