https://www.dropbox.com/install-linux and click on the 32-bit or 64-bit deb as appropriate. open with gdebi
I first checked, don't see it available in apt. I used the commands 'apt list dropbox', then 'apt search dropbox', then tried apt show on a couple of them, didn't seem right
A google search 'ubuntu dropbox' leads me to believe you need to install from source if you want a newer version.
https://linoxide.com/linux-how-to/in...ropbox-ubuntu/
If you're new to bodhi, you'll quickly learn google searching for bodhi doesn't give much results, but ubuntu gives plenty, and as bodhi is based on ubuntu 99% of ubuntu instructions apply.