Trouble setting up screen sharing on Fedora 27 Desktop

Question

I'm running Fedora 27 Desktop edition with GNOME. I've tried instructions from all over the web, but haven't found anything that lets me set up sharing my screen with a remote user. Can anyone help me with this?

Thank you very much in advance for your response.

Here's the story so far:

========

I initially tried:

Activies -> Show Application -> Settings -> Sharing

and saw options:

File Sharing
Media Sharing
Remote Login

But saw no option for Screen Sharing, which one page suggested should be present.

========

I've looked at:

https://docs.fedoraproject.org/f27/system-administrators-guide/Wayland.html

and run

$ echo $WAYLAND_DISPLAY

which yields

wayland-0

but I can't find out how to use this information to solve my problem. I also don't find documentation that screen sharing on Wayland under Fedora 27 is working.

========

Of the many solutions I've tried, I made the best progress by following instructions at https://docs.fedoraproject.org/f27/system-administrators-guide/infrastructure-services/TigerVNC.html

The following commands worked:

sudo dnf install tigervnc-server
sudo cp /lib/systemd/system/[email protected] /etc/systemd/system/[email protected] 

Then I edited /etc/systemd/system/[email protected], replacing <USER> with my user name in the following two lines:

ExecStart=/sbin/runuser -l <USER> -c "/usr/bin/vncserver %i -geometry 1280x1024"
PIDFile=/home/<USER>/.vnc/%H%i.pid

Then I ran:

sudo systemctl daemon-reload

and set a password with:

vncpasswd

Next the site's instructions told me:

With a valid display number, execute the following command:

sudo systemctl enable vncserver@:display_number.service

I've tried using display numbers 0, 1, and 2.

With display number as 1, for example, I got different error messages depending on whether SELinux was set to Enforcing or Permissive.

sudo systemctl start vncserver@:1.service

With 'Enforcing':

Job for vncserver@:1.service failed because the service did not take the steps required by its unit configuration.
See "systemctl  status vncserver@:1.service" and "journalctl  -xe" for details.

After trying the following steps suggested by SELinux:

sudo ausearch -c 'systemd' --raw | audit2allow -M my-systemd
semodule -i my-systemd.pp

and:

sudo ausearch -c 'geoclue' --raw | audit2allow -M my-geoclue
sudo semodule -i my-geoclue.pp

the error message changed to be same as given here for 'Permissive':

Job for vncserver@:1.service failed because the control process exited with error code.
See "systemctl  status vncserver@:1.service" and "journalctl  -xe" for details.

The output of systemctl status vncserver@:1.service was as follows:

● vncserver@:1.service - Remote desktop service (VNC)
   Loaded: loaded (/etc/systemd/system/[email protected]; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2018-03-26 12:24:12 EDT; 3min 4s ago
  Process: 23294 ExecStart=/usr/sbin/runuser -l jazcap53 -c /usr/bin/vncserver :1 (code=exited, status=98)
  Process: 23292 ExecStartPre=/bin/sh -c /usr/bin/vncserver -kill :1 > /dev/null 2>&1 || : (code=exited, status=0/SUCCESS)

Mar 26 12:24:12 localhost.localdomain systemd[1]: Starting Remote desktop service (VNC)...
Mar 26 12:24:12 localhost.localdomain systemd[1]: vncserver@:1.service: Control process exited, code=exited status=98
Mar 26 12:24:12 localhost.localdomain systemd[1]: Failed to start Remote desktop service (VNC).
Mar 26 12:24:12 localhost.localdomain systemd[1]: vncserver@:1.service: Unit entered failed state.
Mar 26 12:24:12 localhost.localdomain systemd[1]: vncserver@:1.service: Failed with result 'exit-code'.

And sudo journalctl -xe produced:

Mar 26 12:27:41 localhost.localdomain systemd[1]: Started SSSD Kerberos Cache Manager.
-- Subject: Unit sssd-kcm.service has finished start-up
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit sssd-kcm.service has finished starting up.
-- 
-- The start-up result is done.
Mar 26 12:27:41 localhost.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sssd-kcm c
Mar 26 12:27:41 localhost.localdomain sssd[kcm][23679]: Starting up
Mar 26 12:27:41 localhost.localdomain systemd[1]: Started SSSD Secrets Service responder.
-- Subject: Unit sssd-secrets.service has finished start-up
-- Defined-By: systemd
-- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit sssd-secrets.service has finished starting up.
-- 
-- The start-up result is done.
Mar 26 12:27:41 localhost.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sssd-secre
Mar 26 12:27:41 localhost.localdomain sssd[secrets][23680]: Starting up
Mar 26 12:30:04 localhost.localdomain sudo[23858]: jazcap53 : TTY=pts/0 ; PWD=/home/jazcap53 ; USER=root ; COMMAND=/bin/journalctl -xe
Mar 26 12:30:04 localhost.localdomain audit[23858]: USER_CMD pid=23858 uid=1001 auid=1001 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg
Mar 26 12:30:04 localhost.localdomain audit[23858]: CRED_REFR pid=23858 uid=0 auid=1001 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg='
Mar 26 12:30:04 localhost.localdomain sudo[23858]: pam_systemd(sudo:session): Cannot create session: Already occupied by a session
Mar 26 12:30:04 localhost.localdomain audit[23858]: USER_START pid=23858 uid=0 auid=1001 ses=3 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 msg=
Mar 26 12:30:04 localhost.localdomain sudo[23858]: pam_unix(sudo:session): session opened for user root by (uid=0)

Answer 1

If you do not have Vino installed, GNOME will not display Screen Sharing as an option.

sudo dnf install vino should do it. You can then set up screenshare as per your initial attempt.