Works :D i had to install libssh2-1 to get everything to install. popos! (Ubuntu based) my guess is same apply to ubuntu :D
I am running Linux Ubuntu Pop!_OS 19.04 as well, and seems like a similarly named package is missing, `libssh2.so.1`? Do you think that is the same one? Perhaps you could hint me how exactly you did install it? Thanks a lot! :-)
Also running Pop_OS! here (19.04). Using some of the earlier posts I got it working after doing the following. If the last command doesn't work, run 'apt --fix-broken install' and try the last command again. After doing this it started working for me!
The reason for this is, as far as I understand it, is that there is a missing patch in the libcurl3-gnutls package in Ubuntu based distributions. However Debian has patched their version of the package. And so installing their version of the package (and its needed dependencies) will get it working.
It is actually better to use packages from an Ubuntu Mirror, because right now, Debian's testing distribution has a newer libcurl3-gnutls version than Ubuntu's testing version. And five days before the final freeze of Ubuntu 19.10 it is quite possible that 19.10 will come with libcurl3-gnutls 7.65.x. So by installing Debian testing's curl and gnutls libraries, one's system will even remain messed up after upgrading to 19.10.
However, if one does not plan to upgrade to 19.10 after its release, one should make sure to use the Debian Buster packages and not the testing ones.