Given Lubuntu 21.04 is now in it’s last week of support, I’d release-upgrade asap or if it’s a new install (you mention installing but gave no timeline though your wording implies to me it’s a recent install) I’d re-install a release that has will still be supported next Friday (21 January 2022).
If this is a new install; I’d suggest starting again with a release that will still be supported on Friday 21 January 2022.
If it’s not a new install I’d release-upgrade asap and look at the issue there as you’ll be using a new kernel stack, thus new kernel modules (aka drivers). I wouldn’t spend a lot of time/energy trying to fix something that is in it’s last week of life/support (though it’s your choice).