I can confirm that in my case it was due to an error in /etc/ssh/sshd_config.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/1691880 Title: package openssh-server 1:7.2p2-4ubuntu2.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 Status in openssh package in Ubuntu: Incomplete Bug description: was trying the update and upgrade command. suddenly got the below error message. Errors were encountered while processing: openssh-server unattended-upgrades E: Sub-process /usr/bin/dpkg returned an error code (1) ProblemType: Package DistroRelease: Ubuntu 16.04 Package: openssh-server 1:7.2p2-4ubuntu2.2 Uname: Linux 4.1.19-v7+ armv7l ApportVersion: 2.20.1-0ubuntu2.5 Architecture: armhf Date: Thu May 18 19:08:41 2017 ErrorMessage: subprocess installed post-installation script returned error exit status 1 RelatedPackageVersions: dpkg 1.18.4ubuntu1.2 apt 1.2.20 SourcePackage: openssh Title: package openssh-server 1:7.2p2-4ubuntu2.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1691880/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
