Dropbox sur ubuntu 17.10 ne marche plus

Bonjour à tous,

J'utilise Dropbox pour mon travail et l'ayant installé sur mon laptop (Ubuntu 17.10) je m'en sers quotidiennement.
Cependant depuis 2 jours l'application ne s'ouvre plus et dans la barre des menu la petite icône ne s'affiche plus normalement (un rectangle gris) : https://imgur.com/Vq8XzOz

Voici ce que ça donne quand j'ouvre dropbox depuis le terminal :

barabbas@barabuntu:~$ dropbox start
Starting Dropbox...dropbox: locating interpreter
dropbox: logging to /tmp/dropbox-antifreeze-yUxXDf
dropbox: initializing
dropbox: running python 2.7.11
dropbox: setting program path '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/dropbox'
dropbox: setting home path '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27'
dropbox: setting python path '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27:/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/python-packages-27.zip'
dropbox: python initialized
dropbox: running dropbox
dropbox: setting args
dropbox: applying overrides
dropbox: running main script
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/cryptography.hazmat.bindings._constant_time.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/cryptography.hazmat.bindings._openssl.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/cryptography.hazmat.bindings._padding.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/psutil._psutil_linux.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/psutil._psutil_posix.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/linuxffi.pthread._linuxffi_pthread.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/tornado.speedups.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/cpuid.compiled._cpuid.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/linuxffi.resolv.compiled._linuxffi_resolv.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/posixffi.libc._posixffi_libc.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/librsyncffi.compiled._librsyncffi.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/linuxffi.sys.compiled._linuxffi_sys.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtWebKit.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtCore.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtNetwork.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtGui.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtWebKitWidgets.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtWidgets.so'
dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtPrintSupport.so'
Dropbox isn't running!
Done!
barabbas@barabuntu:~$ dropbox: load fq extension '/home/barabbas/.dropbox-dist/dropbox-lnx.x86_64-38.4.27/PyQt5.QtDBus.so'

J'ai désinstallé et réinstallé plusieurs fois le logiciel mais rien n'y fait (les logiciels, pilotes/Os sont mis à jour), auriez-vous une idée de la marche à suivre ?

Merci d'avance.

Cordialement
 
                               Barabbas