The problem is with libindicator3
Broken libindicator6:amd64 Breaks on libindicator3 [ amd64 ] < 0.3.22-0ubuntu1 -> 0.3.22-0ubuntu2 > ( universe/libs ) (<= 0.3.93-0ubuntu1)
Considering libindicator3:amd64 10 as a solution to libindicator6:amd64 5
Holding Back libindicator6:amd64 rather than change libindicator3:amd64
Thanks for your report.
The problem is with libindicator3
Broken libindicator6:amd64 Breaks on libindicator3 [ amd64 ] < 0.3.22-0ubuntu1 -> 0.3.22-0ubuntu2 > ( universe/libs ) (<= 0.3.93-0ubuntu1)
Considering libindicator3:amd64 10 as a solution to libindicator6:amd64 5
Holding Back libindicator6:amd64 rather than change libindicator3:amd64