Following steps solved this problem for me on Kubuntu 15.04
1) sudo apt-get install libappindicator3-1 2) manually install latest dropbox stable build
See: https://www.dropboxforum.com/hc/en-us/community/posts/201908279-Systray-icon-not-showing-in-KDE-Plasma-5-2 https://www.dropbox.com/release_notes
Following steps solved this problem for me on Kubuntu 15.04
1) sudo apt-get install libappindicator3-1
2) manually install latest dropbox stable build
See: /www.dropboxfor um.com/ hc/en-us/ community/ posts/201908279 -Systray- icon-not- showing- in-KDE- Plasma- 5-2 /www.dropbox. com/release_ notes
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