There isn’t really a good “set as default” program in Lubuntu, and for some reason the usual ways that browsers set themselves as default just doesn’t work (I don’t know why). As it turns out, there’s a file that stores the default application database in Lubuntu that you can edit manually - doing this will let you set your browser as default. See this documentation page: [SOLVED]Chromium/Google Chrome keeps nagging about not being the default browser Using these instructions, I was able to get Chrome to replace Firefox as the default browser, and I would guess it would probably work for Brave, too.
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