I tried installing Avoagdro from apt on ubuntu 20.04 LTS. This seems to have worked, though I apparently installed avogadro2 and not the “old” avogadro. After also installing openbabel I could “optimize” the structures, however using GAFF, hydrogen atoms get mangled and I miss the “interactive” energy minimization mode.
I tried to download the the avogadro-1.2.0 source from the website and compile. This turned out to be related to some issues. First, running cmake …/ I was alerted to the fact that I needed qt4 and qt5 is now the default apt available version.
I managed to install qt4 though repeating cmake …/ I was now alerted to the fact that I did not have openbabel 2.x installed which is correct as apt installs version 3.
I suppose my questions are these, is there a way around having to install qt4 specifically? qtchooser seems to indicate that I have 4, qt4-x86_64-linux-gnu and qt4 installed. I guess these came bundled with qt5-default(?). cmake obviously caught qt5 as the installed version, I am now curious as the name (qtchooser) seems to indicate it being possible to select a version for use. Is it possible to couple this with cmake or is it only for qmake?
Is there a way around using openbabel2?
And finally, which should likely have been my first question, is there a way to use the “interactive/live” energy minimization mode in avogadro2?
All the best