Bug 415509

SUMMARY

Connection manager does not put the option "autoconnect=true" in the configuration file of nm for a LAN cabled interface when we want an automated connexion of the interface at boot.

If we unselect the option "automatic connection with priority", then connection manager removes  the "autoconnect-priority=n" and put "autoconnect=false" in the   "/etc/NetworkManager/system-connections/LAN.nmconnection" configuration file

If we select the option  "automatic connection with priority", then connection manager only put "autoconnect-priority=n" but DOES NOT PUT THE REQUIRED "autoconnect=true" in the   "/etc/NetworkManager/system-connections/LAN.nmconnection" configuration file

It might be the same for ALL interface types supporting the "autoconnect" option.

STEPS TO REPRODUCE
1. edit a LAN cabled interface connection 
2. unselect then autoconnect option
3. save
4. select then autoconnect option and put priority 98 
5. save
6. examine the autoconnect* directive in /etc/NetworkManager/system-connections/LAN.nmconnection

OBSERVED RESULT
there is no "autoconnect=true" directive in /etc/NetworkManager/system-connections/LAN.nmconnection
there is ONLY an "autoconnect-priority=98" directive in this file

EXPECTED RESULT
there should be an "autoconnect=true" directive in the LAN configuration file otherwise NM will not start this interface at boot.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 19.10
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.65.0
Qt Version: 5.12.4
Kernel Version: 5.3.0-24-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-7700T CPU @ 2.90GHz
Memory: 15,4 Gio

ADDITIONAL INFORMATION
root@minipc:~# dpkg -l plasma-nm
Souhait=inconnU/Installé/suppRimé/Purgé/H=à garder
| État=Non/Installé/fichier-Config/dépaqUeté/échec-conFig/H=semi-installé/W=attend-traitement-déclenchements
|/ Err?=(aucune)/besoin Réinstallation (État,Err: majuscule=mauvais)
||/ Nom            Version                            Architecture Description
+++-==============-==================================-============-=================================
ii  plasma-nm      4:5.17.4-0ubuntu1~ubuntu19.10~ppa1 amd64        Plasma5 networkmanager library.
root@minipc:~# dpkg -l 
Display all 61599 possibilities? (y or n)
root@minipc:~# dpkg -l network-manager
Souhait=inconnU/Installé/suppRimé/Purgé/H=à garder
| État=Non/Installé/fichier-Config/dépaqUeté/échec-conFig/H=semi-installé/W=attend-traitement-déclenchements
|/ Err?=(aucune)/besoin Réinstallation (État,Err: majuscule=mauvais)
||/ Nom             Version         Architecture Description
+++-===============-===============-============-=========================================================
ii  network-manager 1.20.4-2ubuntu2 amd64        network management framework (daemon and userspace tools)