I've seen old threads with Alt + M solution, in documentation armature -> merge, but in 2.9 both ways doesn't work. I need to - obviously - delete second shin and 2nd thigh bone. Yup, rigify.
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$\begingroup$ Did you try pushing X then select "Dissolve Bones"? $\endgroup$ – FFeller Oct 15 '20 at 17:57
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$\begingroup$ It remove one bone with its weight paint data. It would be good but I need some way to merge them in a way that will not mess up my existing animations too much. $\endgroup$ – Velu12 Oct 15 '20 at 18:15
I managed to fix my skeleton by using Vertex Weight Mix modifier. Simply: A=bone which should stay | B=the other one | Vertex set=All | Mix mode=Add +2nd modif for other leg and apply both
Now disconnect bones to prevent its shifting during dissolving (simply uncheck connected checkbox in edit mode) And finally dissolve additional bone with Ctrl + X