For reason that I did not understand Avogadro has been phased out of Ubuntu 20.x and the available package
Avogadro2 is instead another branch of the package, which unfortunately does not cover all the features.
As it appears impossible to install that older but more powerful version of Avogadro on last Ubuntu, does anyone know if it is still possible to delete selected atoms? I am really surprised such a basic feature has been "lost".
Basically, you can click and select atoms (although they do not appear selected for any displaying style but "ball and stick"), but then if you press CANCEL the whole model is deleted (all atoms). I was using this feature a lot to manipulate structures via GUI and now I just can't proceed unless I use my older Ubuntu distribution.