Ubuntu Screen Recorder

Ubuntu come with screen recorder, this can be activated with shortcut

CTRL + ALT + SHIFT + R

By default, it will record for 30 seconds. Video get saved in your home directory (/home/USERNAME) in webm format.

If you want to increase time, you can run following command

gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length  TIME_IN_SECONDS_HERE

It is better to set this to 0, this way record never auto stop. You need to manually stop recording with CTRL + ALT + SHIFT + R key combination.

gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length 0

Default value on Ubuntu 20.04 is “uint32 30”

boby@sok-01:~$ gsettings get org.gnome.settings-daemon.plugins.media-keys max-screencast-length
uint32 30
boby@sok-01:~$ gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-length 0
boby@sok-01:~$ gsettings get org.gnome.settings-daemon.plugins.media-keys max-screencast-length
uint32 0
boby@sok-01:~$ 

See Ubuntu