Steam Deck by Valve will not support PUBG due to anti-cheat issues
On July 15, Valve introduced their portable console Steam Deck, which, as the developers assure, will support the entire Steam library.
However, as it turned out later, it will be impossible to run on Steam Deck several titles - Destiny 2, Apex Legends, Rainbow Six Siege and PUBG. The reason for that is an incompatibility between the operating system of the console (based on Linux) and the anti-cheats in these games. At the moment, Valve is in talks with the developers to solve this problem.
At the same time you'll be able to install Windows on Steam Deck and then there won't be any problems with the launch of PUBG: Battlegrounds and other games.