Wake-on-LAN (WOL)
If your computer supports Wake-on-LAN (mostly for Ethernet connections), you can send a "magic packet" to wake it up.
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Install ethtool
Terminal window sudo apt install ethtool -
Enable WOL
Terminal window sudo ethtool -s eth0 wol g -
Send a wake-up packet
Terminal window wakeonlan {{{IP_ADDRESS_VAR}}}