Public bug reported:
# grep hosts /etc/nsswitch.conf
hosts: files myhostname dns
# apt install libnss-resolve
# grep hosts /etc/nsswitch.conf
hosts: files myhostname resolve [!UNAVAIL=return] dns
# apt remove libnss-resolve
# grep hosts /etc/nsswitch.conf
hosts: files myhostname dns
# apt install libnss-resolve
# grep hosts /etc/nsswitch.conf
hosts: files myhostname dns
libnss-resolve.postinst and libnss-myhostname.postinst only update
/etc/nsswitch.conf if [ "$1" = configure ] && [ -z "$2" ]. If the
package was previously removed but not purged (it is in the Config-Files
state), dpkg passes the previous version as $2, so this fails.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: zesty
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https://bugs.launchpad.net/bugs/1649370
Title:
libnss-{resolve,myhostname} don’t install correctly if previously
removed without being purged
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