Last lines of DpkgTerminalLog.txt:
Running newaliases
newaliases: warning: valid_hostname: invalid character 40(decimal):
ubuntu.(null)
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad
parameter value: ubuntu.(null)
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: postfix (Ubuntu)
Status: New = Confirmed
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This is not a bug. This is the package doing it's job of not accepting
invalid input data. You need to pick a valid hostname.
** Changed in: postfix (Ubuntu)
Status: Confirmed = Invalid
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https://bugs.launchpad.net/bugs/982917
Title:
package postfix 2.9.1-2 failed to install/upgrade: le sous-processus
script post-installation installé a retourné une
