Just adding another voice to this thread. I had the same problem during the upgrade. The failure for sendmail-bin to properly configure caused the sensible-mta, dovecot-core and inn2 packages to all fail to properly update due to dependency problems. Thanks to Mirko above, who suggested a solution. Stopping the sendmail service and running "apt install -f" allowed the configuration to complete.
In case it is any help, here are the relevant log messages: Messages from /var/log/dist-upgrade/main.log: ERROR got an error from dpkg for pkg: 'sendmail-bin': 'installed sendmail-bin package post-installation script subprocess returned error exit status 2' 2019-07-07 22:44:50,515 DEBUG running apport_pkgfailure() sendmail-bin: installed sendmail-bin package post-installation script subprocess returned error exit status 2 2019-07-07 22:44:50,528 ERROR got an error from dpkg for pkg: 'sendmail-bin': 'installed sendmail-bin package post-installation script subprocess returned error exit status 2' 2019-07-07 22:47:47,560 ERROR got an error from dpkg for pkg: 'sendmail': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:47,561 DEBUG running apport_pkgfailure() sendmail: dependency problems - leaving unconfigured 2019-07-07 22:47:47,561 DEBUG dpkg error because of dependency problems, not reporting against sendmail 2019-07-07 22:47:47,561 ERROR got an error from dpkg for pkg: 'sendmail': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:47,758 ERROR got an error from dpkg for pkg: 'sensible-mda': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:47,758 DEBUG running apport_pkgfailure() sensible-mda: dependency problems - leaving unconfigured 2019-07-07 22:47:47,759 DEBUG dpkg error because of dependency problems, not reporting against sensible-mda 2019-07-07 22:47:47,759 ERROR got an error from dpkg for pkg: 'sensible-mda': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:48,269 ERROR got an error from dpkg for pkg: 'inn2': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:48,270 DEBUG running apport_pkgfailure() inn2: dependency problems - leaving unconfigured 2019-07-07 22:47:48,270 DEBUG dpkg error because of dependency problems, not reporting against inn2 2019-07-07 22:47:48,270 ERROR got an error from dpkg for pkg: 'inn2': 'dependency problems - leaving unconfigured' 2019-07-07 22:47:52,116 ERROR got an error from dpkg for pkg: 'dovecot-core': 'triggers looping, abandoned' 2019-07-07 22:47:52,116 DEBUG running apport_pkgfailure() dovecot-core: triggers looping, abandoned 2019-07-07 22:47:52,132 ERROR got an error from dpkg for pkg: 'dovecot-core': 'triggers looping, abandoned' 2019-07-07 22:51:47,341 ERROR Exception during pm.DoInstall() Traceback (most recent call last): File "/tmp/ubuntu-release-upgrader-nggm0iiu/DistUpgrade/DistUpgradeView.py", line 220, in run res = pm.do_install(self.writefd) apt_pkg.Error: E:Sub-process /usr/bin/dpkg returned an error code (1) 2019-07-07 22:51:47,369 ERROR SystemError from cache.commit(): installArchives() failed 2019-07-07 22:51:47,370 ERROR found exception: 'E:Sub-process /usr/bin/dpkg returned an error code (1)' 2019-07-07 22:55:43,205 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py' 2019-07-07 22:55:43,218 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process “./xorg_fix_proprietary.py” (No such file or directory) (8)) Messages from /var/log/dist-upgrade/apt-term.log: Setting up sendmail-bin (8.15.2-12) ... Installing new version of config file /etc/init.d/sendmail ... update-alternatives: warning: forcing reinstallation of alternative /usr/lib/sm.bin/sendmail because link group sendmail-mta is broken Saving old /etc/mail/sendmail.cf as /etc/mail/sendmail.cf.old ... start-stop-daemon: matching only on non-root pidfile /var/run/sendmail/mta/sendmail.pid is insecure dpkg: error processing package sendmail-bin (--configure): installed sendmail-bin package post-installation script subprocess returned error exit status 2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1822866 Title: package sendmail-bin 8.15.2-12 failed to install/upgrade: installed sendmail-bin package post-installation script subprocess returned error exit status 2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sendmail/+bug/1822866/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs