I missed to system information. Here is it:
# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.4 LTS Release: 18.04 Codename: bionic
# dpkg -l "avahi*" Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-========================================-=========================-=========================-===================================================================================== ii avahi-autoipd 0.7-3.1ubuntu1.2 amd64 Avahi IPv4LL network address configuration daemon ii avahi-daemon 0.7-3.1ubuntu1.2 amd64 Avahi mDNS/DNS-SD daemon ii avahi-utils 0.7-3.1ubuntu1.2 amd64 Avahi browsing, publishing and discovery utilities
I missed to system information. Here is it:
# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
# dpkg -l "avahi*" Unknown/ Install/ Remove/ Purge/Hold Not/Inst/ Conf-files/ Unpacked/ halF-conf/ Half-inst/ trig-aWait/ Trig-pend /Reinst- required (Status,Err: uppercase=bad) ======= ======= ======= ======= ======= ==-==== ======= ======= ======= -====== ======= ======= =====-= ======= ======= ======= ======= ======= ======= ======= ======= ======= ======= ======= =======
Desired=
| Status=
|/ Err?=(none)
||/ Name Version Architecture Description
+++-===
ii avahi-autoipd 0.7-3.1ubuntu1.2 amd64 Avahi IPv4LL network address configuration daemon
ii avahi-daemon 0.7-3.1ubuntu1.2 amd64 Avahi mDNS/DNS-SD daemon
ii avahi-utils 0.7-3.1ubuntu1.2 amd64 Avahi browsing, publishing and discovery utilities