[!NOTE|label:references:]
get screen solution
$ xrandr --verbose
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
XWAYLAND0 connected 1920x1080+0+0 (0x22) normal (normal left inverted right x axis y axis) 480mm x 270mm
Identifier: 0x21
Timestamp: 3807
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 0.0
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
1920x1080 (0x22) 173.000MHz -HSync +VSync *current +preferred
h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.16KHz
v: height 1080 start 1083 end 1088 total 1120 clock 59.96Hz
screen sharing
setup screen sharing
#!/usr/bin/env bash
export DISPLAY=:0
read -e -p "VNC Password: " -i "ubuntu" password
dconf write /org/gnome/desktop/remote-access/enabled true
dconf write /org/gnome/desktop/remote-access/prompt-enabled false
dconf write /org/gnome/desktop/remote-access/authentication-methods "['vnc']"
dconf write /org/gnome/desktop/remote-access/require-encryption false08/03/2018
dconf write /org/gnome/desktop/remote-access/vnc-password \"\'$(echo -n $password | base64)\'\"
dconf dump /org/gnome/desktop/remote-access/
## sudo service lightdm restart
or
$ read -e -p "VNC Password: " -i "ubuntu" VNCPASSWORD $ dconf write /org/gnome/desktop/remote-access/enabled true $ dconf write /org/gnome/desktop/remote-access/authentication-methods "['vnc']" $ dconf write /org/gnome/desktop/remote-access/prompt-enabled false $ dconf write /org/gnome/desktop/remote-access/require-encryption false $ dconf write /org/gnome/desktop/remote-access/vnc-password \"\'$(echo -n $VNCPASSWORD | base64)\'\" $ sudo service lightdm restartor
$ vino-preference $ dconf-editor
start x server
$ export DISPLAY=:0
$ /usr/lib/vino/vino-server --display=:0 &
backup and restore config
$ dconf dump /org/gnome/desktop/remote-access/ > ubuntu1804_remoteaccess
$ cat ubuntu1804_remoteaccess
[/]
require-encryption=false
vnc-password='bWFyc2xv'
authentication-methods=['vnc']
prompt-enabled=false
$ dconf load /org/gnome/desktop/remote-access/ < ubuntu1804_remoteaccess
read all conf
$ for i in $(gsettings list-keys org.gnome.Vino); do
echo -e "$i:\t --> "$(dconf read /org/gnome/desktop/remote-access/$i);
done
notify-on-connect: -->
alternative-port: -->
disable-background: -->
use-alternative-port: -->
icon-visibility: -->
use-upnp: -->
view-only: -->
prompt-enabled: --> false
disable-xdamage: -->
authentication-methods: --> ['vnc']
network-interface: -->
require-encryption: --> false
mailto: -->
lock-screen-on-disconnect: -->
vnc-password: --> 'bWFyc2xv'
reset vnc password
$ echo -n 'awesome' | base64
$ gconftool-2 -s -t string /desktop/gnome/remote_access/vnc_password $(echo -n "<YOURPASSWORD>" | base64)
$ gconftool-2 --type string --set /desktop/gnome/remote_acess/vnc_password '123456'
- or
$ echo -n "marslo" | base64 bWFyc2xv
check using wayland or xorg
$ echo $XDG_SESSION_TYPE
- Ubuntu: Wayland (Wayland)
- Ubuntu on Xorg: Xorg (X11)
start application remotely
$ export DISPLAY=:0
$ gnome-terminal
gdm
$ cat /lib/systemd/system/gdm.service
[Unit]
Description=GNOME Display Manager
## replaces the getty
Conflicts=getty@tty1.service
After=getty@tty1.service
## replaces plymouth-quit since it quits plymouth on its own
Conflicts=plymouth-quit.service
After=plymouth-quit.service
## Needs all the dependencies of the services it's replacing
## pulled from getty@.service and plymouth-quit.service
## (except for plymouth-quit-wait.service since it waits until
## plymouth is quit, which we do)
After=rc-local.service plymouth-start.service systemd-user-sessions.service
## GDM takes responsibility for stopping plymouth, so if it fails
## for any reason, make sure plymouth still stops
OnFailure=plymouth-quit.service
[Service]
ExecStartPre=/usr/share/gdm/generate-config
ExecStart=/usr/sbin/gdm3
KillMode=mixed
Restart=always
RestartSec=1s
IgnoreSIGPIPE=no
BusName=org.gnome.DisplayManager
StandardOutput=syslog
StandardError=inherit
EnvironmentFile=-/etc/default/locale
ExecReload=/usr/share/gdm/generate-config
ExecReload=/bin/kill -SIGHUP $MAINPID
gnome-shell
autologin
login with desired session
$ cat /var/lib/AccountsService/users/devops [User] FormatsLocale=en_US.UTF-8 XSession=gnome-xorg SystemAccount=false [InputSource0] xkb=usauto login with gdm
$ grep -i auto /etc/gdm3/custom.conf [daemon] ## Enabling automatic login AutomaticLoginEnable = true AutomaticLogin = devopsauto login with delay
$ grep -i time /etc/gdm3/custom.conf [daemon] ## Enabling timed login ## TimedLoginEnable = true ## TimedLogin = user1 ## TimedLoginDelay = 10
login session
default session
$ cat /etc/X11/default-display-manager
/usr/sbin/gdm3
process and subprocesses
pstree
$ pstree 1391
gdm3─┬─gdm-session-wor─┬─gdm-x-session─┬─Xorg───{Xorg}
│ │ ├─gnome-session-b─┬─deja-dup-monito───4*[{deja-dup-monito}]
│ │ │ ├─gnome-software───3*[{gnome-software}]
│ │ │ ├─gsd-a11y-settin───3*[{gsd-a11y-settin}]
│ │ │ ├─gsd-clipboard───2*[{gsd-clipboard}]
│ │ │ ├─gsd-color───3*[{gsd-color}]
│ │ │ ├─gsd-datetime───3*[{gsd-datetime}]
│ │ │ ├─gsd-disk-utilit───2*[{gsd-disk-utilit}]
│ │ │ ├─gsd-housekeepin───3*[{gsd-housekeepin}]
│ │ │ ├─gsd-keyboard───3*[{gsd-keyboard}]
│ │ │ ├─gsd-media-keys───3*[{gsd-media-keys}]
│ │ │ ├─gsd-mouse───3*[{gsd-mouse}]
│ │ │ ├─gsd-power───3*[{gsd-power}]
│ │ │ ├─gsd-print-notif───2*[{gsd-print-notif}]
│ │ │ ├─gsd-rfkill───2*[{gsd-rfkill}]
│ │ │ ├─gsd-screensaver───2*[{gsd-screensaver}]
│ │ │ ├─gsd-sharing───3*[{gsd-sharing}]
│ │ │ ├─gsd-smartcard───4*[{gsd-smartcard}]
│ │ │ ├─gsd-sound───3*[{gsd-sound}]
│ │ │ ├─gsd-wacom───2*[{gsd-wacom}]
│ │ │ ├─gsd-xsettings───3*[{gsd-xsettings}]
│ │ │ ├─nautilus-deskto───3*[{nautilus-deskto}]
│ │ │ ├─ssh-agent
│ │ │ ├─update-notifier───3*[{update-notifier}]
│ │ │ └─3*[{gnome-session-b}]
│ │ └─2*[{gdm-x-session}]
│ └─2*[{gdm-session-wor}]
└─2*[{gdm3}]
ps
$ ps auxwwf
/usr/sbin/gdm3
\_ gdm-session-worker [pam/gdm-autologin]
\_ /usr/lib/gdm3/gdm-x-session --run-script env GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
\_ /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3
\_ /usr/lib/gnome-session/gnome-session-binary --session=ubuntu
\_ /usr/bin/ssh-agent /usr/bin/im-launch env GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
\_ /usr/lib/gnome-settings-daemon/gsd-power
\_ /usr/lib/gnome-settings-daemon/gsd-print-notifications
\_ /usr/lib/gnome-settings-daemon/gsd-rfkill
\_ /usr/lib/gnome-settings-daemon/gsd-screensaver-proxy
\_ /usr/lib/gnome-settings-daemon/gsd-sharing
\_ /usr/lib/gnome-settings-daemon/gsd-smartcard
\_ /usr/lib/gnome-settings-daemon/gsd-sound
\_ /usr/lib/gnome-settings-daemon/gsd-xsettings
\_ /usr/lib/gnome-settings-daemon/gsd-wacom
\_ /usr/lib/gnome-settings-daemon/gsd-clipboard
\_ /usr/lib/gnome-settings-daemon/gsd-a11y-settings
\_ /usr/lib/gnome-settings-daemon/gsd-datetime
\_ /usr/lib/gnome-settings-daemon/gsd-color
\_ /usr/lib/gnome-settings-daemon/gsd-keyboard
\_ /usr/lib/gnome-settings-daemon/gsd-housekeeping
\_ /usr/lib/gnome-settings-daemon/gsd-mouse
\_ /usr/lib/gnome-settings-daemon/gsd-media-keys
\_ /usr/lib/gnome-disk-utility/gsd-disk-utility-notify
\_ /usr/bin/gnome-software --gapplication-service
\_ nautilus-desktop
\_ update-notifier
\_ /usr/lib/deja-dup/deja-dup-monitor
$ ps auxwwf
root 1391 0.0 0.1 308176 8340 ? Ssl 16:58 0:00 /usr/sbin/gdm3
root 1456 0.0 0.1 271860 8720 ? Sl 16:58 0:00 \_ gdm-session-worker [pam/gdm-autologin]
devops 1497 0.0 0.0 212124 6000 tty1 Ssl+ 16:58 0:00 \_ /usr/lib/gdm3/gdm-x-session --run-script env GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
devops 1499 0.4 1.0 370392 81984 tty1 Sl+ 16:58 0:02 \_ /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3
devops 1518 0.0 0.1 716920 15716 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-session/gnome-session-binary --session=ubuntu
devops 1599 0.0 0.0 11304 320 ? Ss 16:58 0:00 \_ /usr/bin/ssh-agent /usr/bin/im-launch env GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
devops 2471 0.0 0.2 527336 23468 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-power
devops 2472 0.0 0.1 349316 10144 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-print-notifications
devops 2475 0.0 0.0 423340 5728 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-rfkill
devops 2481 0.0 0.0 275728 5048 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-screensaver-proxy
devops 2485 0.0 0.1 471340 11980 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-sharing
devops 2493 0.0 0.1 466472 10096 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-smartcard
devops 2495 0.0 0.1 343116 9808 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-sound
devops 2499 0.0 0.2 504824 23460 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-xsettings
devops 2511 0.0 0.2 440656 22568 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-wacom
devops 2530 0.0 0.2 355824 21572 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-clipboard
devops 2531 0.0 0.1 296660 8348 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-a11y-settings
devops 2532 0.0 0.1 476600 15176 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-datetime
devops 2536 0.0 0.3 678216 24396 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-color
devops 2537 0.0 0.2 508124 22096 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-keyboard
devops 2539 0.0 0.1 374712 8804 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-housekeeping
devops 2542 0.0 0.1 296672 8284 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-mouse
devops 2545 0.0 0.3 1155368 24656 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-settings-daemon/gsd-media-keys
devops 2589 0.0 0.0 271928 6216 tty1 Sl+ 16:58 0:00 \_ /usr/lib/gnome-disk-utility/gsd-disk-utility-notify
devops 2590 0.4 1.8 1318392 152212 tty1 SLl+ 16:58 0:02 \_ /usr/bin/gnome-software --gapplication-service
devops 2599 0.2 0.9 1197708 75864 tty1 Sl+ 16:58 0:01 \_ nautilus-desktop
devops 3686 0.0 0.3 605436 28680 tty1 Sl+ 16:59 0:00 \_ update-notifier
devops 4017 0.0 0.4 118225468 32448 tty1 Sl+ 17:00 0:00 \_ /usr/lib/deja-dup/deja-dup-monitor
Wayland
$ echo $WAYLAND_DISPLAY
wayland-0
wayland known error
cat <<EOF | sudo tee /etc/xdg/autostart/xhost.desktop
[Desktop Entry]
Name=xhost
Comment=Fix graphical root applications
Exec="xhost +si:localuser:root"
Terminal=false
Type=Application
EOF