• list the interfaces

  # ip link show

• activate the interface

  # ifconfig ens19 up

• set the IP of the interface:

  # nano /etc/netplan/00-installer-config.yaml

  and add the interface name and the settings

• apply the settings:

  # netplan apply

• # nano /etc/lightdm/lightdm.conf.d/restart-NM.sh   //// and enter in it:
  #!/bin/bash
  
  # wait 20 secondes
  sleep 20s
  
  #restart NetworkManager 
  service network-manager restart
  
  exit 0

• # chmod +x /etc/lightdm/lightdm.conf.d/restart-NM.sh

• # nano /etc/lightdm/lightdm.conf.d/10-restart-NM.conf   //// and enter in it:
  [SeatDefaults]
  session-setup-script=/etc/lightdm/lightdm.conf.d/restart-NM.sh 

Pour activer le “beep”:

• # apt-get install beep

• tester si le beep fonctionne:

  $ sudo modprobe pcspkr     // ce réglage ne supportera pas un reboot!!
  $ beep

• Rendre persistant:

  $ sudo nano /etc/modprobe.d/blacklist.conf
  ....

  et commenter la ligne blacklist pcspkr

works for Lubuntu20:

sudo dpkg-reconfigure keyboard-configuration

and maek your choise.

Source: https://askubuntu.com/questions/819789/permanently-disable-touchpad-lubuntu-16-04
For “Lubuntu” (LXDE): Preferences>Default applications for LXSession>AutoStart> then “Add” synclient TouchpadOff=1

https://gitlab.gnome.org/World/OpenPaperwork/paperwork/blob/master/flatpak/README.markdown#readme

If one day all your icons are always on the left side of the desktop and their position is not remembered between the sessions: check the permissions and make a correct setting:

$ find . '!' -user $USER              and look if "./.local/share/gvfs-metadata/home" is present into the list of files not owned by you
$ ls -al ./.local/share/gvfs-metadata/home   will show who is the owner (generally this is "root")
$ sudo chown -R your_user_name:the_group .local/share/gvfs-metadata/home   

Logout and re-login: the problem should be gone.

Via RDP
Install and run the script given here: http://c-nergy.be/blog/?p=11868
See https://help.ubuntu.com/community/xrdp too.

https://linuxconfig.org/how-to-run-script-on-startup-on-ubuntu-20-04-focal-fossa-server-desktop

$ sudo cat /usr/local/bin/wol-omv.sh 
#!/bin/bash

/usr/sbin/etherwake -i enp34s0 00:11:22:33:44:55

$ sudo cat /etc/systemd/system/wol-omv.service 
[Unit]
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/wol-omv.sh

[Install]
WantedBy=default.target

# chmod 744 /usr/local/bin/wol-omv.sh
# chmod 664 /etc/systemd/system/wol-omv.service

sudo systemctl daemon-reload
# systemctl enable wol-omv.service

https://unix.stackexchange.com/questions/599372/kill-systemd-oneshot-service-after-timeout
https://trstringer.com/simple-vs-oneshot-systemd-service/
https://docs.fedoraproject.org/en-US/quick-docs/understanding-and-administering-systemd/

$ sudo cat /etc/systemd/system/le-service.service 
[Unit]
After=network-online.target
Wants=network-online.target

[Service]
Type=oneshot
TimeoutStartSec=10s
ExecStart=/usr/local/bin/le-script.sh

[Install]
WantedBy=default.target

Il faut un “TimeoutStartSec” et non un “TimeoutStopSec” car “Behavior of oneshot is similar to simple; however, the service manager will consider the unit started after the main process exits.”

https://serverfault.com/questions/267099/terminal-only-shows

Settings of webcam:

• $ sudo apt-get install v4l-utils

• $ v4l2-ctl -l

  to list the possible settings

• $ v4l2-ctl -c focus_auto=0

  to disable the autofocus

• $ v4l2-ctl -c focus_absolute=100

  to set the focus at value “100”

installed via the software manager (look for “guvcview”)