Fail to brew install --cask google-chrome in GNU/Linux Ubuntu 21.04

[elisencode]

.dotfiles 1 % brew search google-chrome                                                8:56:49
==> Formulae
googler

.dotfiles 1 % brew info google-chrome                                                  8:59:10
google-chrome: 94.0.4606.71 (auto_updates)
https://www.google.com/chrome/
Not installed
From: https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/google-chrome.rb
==> Name
Google Chrome
==> Description
Web browser
==> Artifacts
Google Chrome.app (App)
==> Analytics
install: 25,382 (30 days), 51,889 (90 days), 195,471 (365 days)

.dotfiles 1 % brew install --cask google-chrome                                        8:59:32
Error: Installing casks is supported only on macOS