postconf: warning: valid_hostname: numeric hostname: 01 postconf: fatal: unable to use my own hostname postconf: warning: valid_hostname: numeric hostname: 01 postconf: fatal: unable to use my own hostname dpkg: error processing package postfix (--configure): installed postfix package post-installation script subprocess returned error exit status 1 Setting up mailutils-common (1:3.4-1) ... Setting up libgsasl7:amd64 (1.8.0-8ubuntu3) ... Setting up libmailutils5:amd64 (1:3.4-1) ... dpkg: dependency problems prevent configuration of mailutils: mailutils depends on default-mta | mail-transport-agent; however: Package default-mta is not installed. Package postfix which provides default-mta is not configured yet. Package mail-transport-agent is not installed. Package postfix which provides mail-transport-agent is not configured yet. dpkg: error processing package mailutils (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Processing triggers for systemd (237-3ubuntu10.38) ... Processing triggers for man-db (2.8.3-2ubuntu0.1) ... Processing triggers for rsyslog (8.32.0-1ubuntu4) ... Processing triggers for ufw (0.36-0ubuntu0.18.04.1) ... Rules updated for profile 'Nginx HTTP' Skipped reloading firewall Processing triggers for ureadahead (0.100.0-21) ... Processing triggers for libc-bin (2.27-3ubuntu1.2) ... Errors were encountered while processing: postfix mailutils E: Sub-process /usr/bin/dpkg returned an error code (1)
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