No Dropbox icon in the indicator panel?

I have recently installed Ubuntu on my machine and everything has been working fine, except I don't see the Dropbox indicator. I have installed and re-installed Dropbox multiple times and can confirm that it's running in the background (with ps -e | grep dropbox).

Does anyone know how to get it back?

Found a solution at the comment #7 from the Ubuntu bug:

1. Install package sudo apt-get install libappindicator1

2. Log out, and then log back in (or issue dropbox stop && dropbox start at the command line)

Note: this method is still applicable in 2021 year, it fixes the problem with Dropbox icon in Ubuntu MATE 21.10.

If I recall correctly there is an unfixed bug in the dropbox package for 13.10. Cf. launchpad. This is at present a confirmed, but unassigned bug.

If this is not that bug, then read this question.

There is another issue that has popped up recently.
This is with regard to 14.04, being that,

Dropbox runs in the background but does not show the indicator panel icon even when appindicator1 is installed.

The only work around i found was to re-install Dropbox by getting the .deb file form the link: Download Dropbox