Stable Build 83.4.152

I'm on Ubuntu 19.10, as verified with the command

$  lsb_release -ds

Dropbox Support gave me a very helpful suggestion yielding a clue, which was to issue the command:

$ nautilus --version

Here's what that command did, for me:
  Initializing nautilus-dropbox 2019.02.14
  GNOME nautilus 3.34.1
  Segmentation fault (core dumped)

Clearly, nautilus should be able to tell us its version, without seg faulting!

I had re-installed Dropbox according to their instructions.

I've asked them for additional help, where I poked around and found other problems, where it seems that nautilus-dropbox is not installed and won't install.

It could be interesting if you issue the same command,

$ nautilus --version

I'm curious as to how your system responds.

Then I can pass your command's output along to the Dropbox Support people, since I've told them that this problem affects more than one person.