I wrote the Lubuntu 22.04 LTS image to a DVDR. Booted it up on
hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)
and beyond taking ages to boot (which I’d remembered) it being noisy (this box is usually only tested with thumb-drives), it eventually booted. On opening firefox
there is the delay which occurs now on first run due to snap package (the snap image on media is squashfs which needs to be unompressed*) then I get the firefox
window and a “Welcome to Firefox”.
To look at what your actual issue, at least to me, a bug report is needed so we have more specific details we can examine. Presently from my just-run test, the likely issue to me is back to media write (mostly as I use thumb-drives which aren’t the most reliable media being made to cost & failures occur)
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Yes it’s slow to load; I didn’t time it; but that is expected as it’s assumed these days thumb-drive media is used; and the only checks performed for those still using DVDs is that it boots, runs and can install - even if slow.
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I could not replicate that issue
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firefox
is present when ISO is written to thumb-drive, or DVDR and booted.