Estou encontrando este erro ao executar qualquer comando para instalar o pacote. Eu sou novo no Linux e não quero complicar ainda mais as coisas, já que tentei muitas coisas, mas nenhuma delas funcionou.
Postfix configuration was not changed. If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed. To view Postfix configuration
values, see postconf(1).
After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.
Running newaliases
newaliases: warning: valid_hostname: numeric hostname: 172.31.1.130
newaliases: fatal: file /etc/postfix/main.cf: parameter mydomain: bad parameter value: 172.31.1.130
dpkg: error processing package postfix (--configure):
subprocess installed post-installation script returned error exit status 75
Processing triggers for libc-bin (2.23-0ubuntu10) ...
Errors were encountered while processing:
postfix
E: Sub-process /usr/bin/dpkg returned an error code (1)