Tested this on Pixel3a, Rasberry pi, Pinephone & Oppo f1.

Make partition writable

sudo mount -o remount,rw /

Create these files with following content, without affecting update or anything, create folder path witjh mkdir -p if required

/etc/systemd/resolved.conf.d/mdns-systemd-resolved.conf

[Resolve]
MulticastDNS=yes

/etc/NetworkManager/conf.d/mdns.conf

[connection]
connection.mdns=2

Reboot or restart systemd-resolved.service and NetworkManager.service. Do this on your local machine as well (may also need reboot)

Restart sshd. (sudo systemctl restart sshd)

Now we can ssh into phone with hostaname.local

ssh phablet@ubuntu-phablet.local

And .local domains now resolves.

$ resolvectl query -4 ubuntu-phablet.local
ubuntu-phablet.local: 192.168.29.144           -- link: wlan0

-- Information acquired via protocol DNS in 16.6ms.
-- Data is authenticated: yes

Remount filesystem as readonly

sudo mount -o remount,ro /

We can also broadcast sftp with systemd-dnssd

/etc/systemd/dnssd/sftp.dnssd

[Service]
Name=%H
Type=_sftp-ssh._tcp
Port=22

And it will appear on nautilus network share

@kugiigi

What I wanted to do is place custom wifi config in conf.d directory. But there is no such folder under system-connection. If I create one network manager seems to ignore it and keep using the old ones.

Hi,

I can do that though network manager on desktop,setting ip and gateway. Like 192.168.1.100

Is there anyway to do that ? I check under /etc/network-manager/system-connection. Though not sure how and which one to edit without affecting updates.

Using focal rc on pixel 3a.