Lubuntu 21.04 is now EOL or end-of-life and thus unsupported on this site.
Official blog - https://lubuntu.me/hirsute-eol/ (the official blog propagates to other sites as well (eg. Planet Ubuntu let alone appearing in many RSS feeds etc)
plus the links already provided by @That_Random_Guy in his prior post on this site.
FYI: I had both opera-stable and google-chrome-stable installed on this box, and also did so without issues on this box for the six months I was running hirsute (21.04), but given the release is now unsupported I’ve moved the question to off-topic and you’ll find many of us won’t provide support for your release, unless it’s specific questions related to helping you move to a supported release (which will get more and more difficult as time progresses, as you’ll note in this notice
As of January 20, 2022, Ubuntu 21.04 is no longer supported. No more package updates will be accepted to 21.04, and it will be archived to old-releases.ubuntu.com in the coming weeks.
I added the bold; the move has not yet occurred in my check before I wrote this, but it can occur anytime now (I noted a number of packages for hirsute were still in -proposed waiting their seven days… maybe Brian is waiting for that to pass so they can get archived as well instead of being dropped & work done being lost… either way any users who upgraded to impish had got those fixes already so waiting makes no sense before upgrade)