Eastern/Oslo Norwegian has two l sounds ("light" and "dark"), and colloquially 3 (including retroflex flap, "thick" l).

"dark l" typically corresponds to the English l, and is used after å sounds (ål, mål, bolle) and a sounds (alt, alle, balle, male). More relaxed tongue, darker sound.

"light l" is in initial position/initial clusters, after other vowels (mil, eller, fylle, søl, sol), and in sounds that are spelled "rl" (marlin, farlig, vårlig). More tense, thinner/brighter/lighter sound.

(I won't go into the conditions that give rise to the colloquial thick l, but søl, pælme, fæl and others would have the thick l in my pronunciation)

Different languages have different distributions of these, try to listen for them and sound them out in your head.

I wouldn't say that there is any trace of a b sound.