dpkg -l | grep ceph
ii  ceph                                 10.2.3-1xenial                        amd64        distributed storage and file system
ii  ceph-base                            10.2.3-1xenial                        amd64        common ceph daemon libraries and management tools
ii  ceph-common                          10.2.3-1xenial                        amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-fs-common                       10.2.3-1xenial                        amd64        common utilities to mount and interact with a ceph file system
ii  ceph-fuse                            10.2.3-1xenial                        amd64        FUSE-based client for the Ceph distributed file system
ii  ceph-mds                             10.2.3-1xenial                        amd64        metadata server for the ceph distributed file system
ii  ceph-mon                             10.2.3-1xenial                        amd64        monitor server for the ceph storage system
ii  ceph-osd                             10.2.3-1xenial                        amd64        OSD server for the ceph storage system
ii  libcephfs1                           10.2.3-1xenial                        amd64        Ceph distributed file system client library
ii  python-ceph                          10.2.3-1xenial                        amd64        Meta-package for python libraries for the Ceph libraries
ii  python-cephfs                        10.2.3-1xenial                        amd64        Python libraries for the Ceph libcephfs library



apt-get install ceph
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  liblttng-ust-ctl2 liblttng-ust0 liburcu4
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  ceph-common ceph-mds libcephfs1 librados2 libradosstriper1 librbd1 librgw2 python-ceph python-cephfs python-rados python-rbd
The following packages will be REMOVED:
  ceph-base ceph-mon ceph-osd
The following packages will be upgraded:
  ceph ceph-common ceph-mds libcephfs1 librados2 libradosstriper1 librbd1 librgw2 python-ceph python-cephfs python-rados python-rbd
12 upgraded, 0 newly installed, 3 to remove and 58 not upgraded.
2 not fully installed or removed.
Need to get 0 B/40.7 MB of archives.
After this operation, 327 MB disk space will be freed.
Do you want to continue? [Y/n] 
(Reading database ... 77997 files and directories currently installed.)
Preparing to unpack .../ceph-mds_10.2.5-0ubuntu0.16.04.1_amd64.deb ...
Unpacking ceph-mds (10.2.5-0ubuntu0.16.04.1) over (10.2.3-1xenial) ...
dpkg: error processing archive /var/cache/apt/archives/ceph-mds_10.2.5-0ubuntu0.16.04.1_amd64.deb (--unpack):
 trying to overwrite '/usr/bin/cephfs-table-tool', which is also in package ceph-common 10.2.3-1xenial
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for man-db (2.7.5-1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/ceph-mds_10.2.5-0ubuntu0.16.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)