It looks like ceph-deploy@2.0.0 is incompatible with systems running 14.04 and it got released in the luminous branch with the new deployment commands.
Is there anyway to downgrade to an older version?
Log of osd list
XYZ@XYZStat200:~/XYZ-cluster$ ceph-deploy --overwrite-conf osd list XYZCeph204
[ceph_deploy.conf][DEBUG ] found configuration file at: /home/XYZ/.cephdeploy.conf
[ceph_deploy.cli][INFO ] Invoked (2.0.0): /usr/bin/ceph-deploy --overwrite-conf osd list XYZCeph204
[ceph_deploy.cli][INFO ] ceph-deploy options:
[ceph_deploy.cli][INFO ] username : None
[ceph_deploy.cli][INFO ] verbose : False
[ceph_deploy.cli][INFO ] debug : False
[ceph_deploy.cli][INFO ] overwrite_conf : True
[ceph_deploy.cli][INFO ] subcommand : list
[ceph_deploy.cli][INFO ] quiet : False
[ceph_deploy.cli][INFO ] cd_conf : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f12aed80560>
[ceph_deploy.cli][INFO ] cluster : ceph
[ceph_deploy.cli][INFO ] host : ['XYZCeph204']
[ceph_deploy.cli][INFO ] func : <function osd at 0x7f12af1e80c8>
[ceph_deploy.cli][INFO ] ceph_conf : None
[ceph_deploy.cli][INFO ] default_release : False
XYZ@XYZceph204's password:
[XYZCeph204][DEBUG ] connection detected need for sudo
XYZ@XYZceph204's password:
[XYZCeph204][DEBUG ] connected to host: XYZCeph204
[XYZCeph204][DEBUG ] detect platform information from remote host
[XYZCeph204][DEBUG ] detect machine type
[XYZCeph204][DEBUG ] find the location of an executable
[XYZCeph204][INFO ] Running command: sudo /sbin/initctl version
[XYZCeph204][DEBUG ] find the location of an executable
[ceph_deploy.osd][INFO ] Distro info: Ubuntu 14.04 trusty
[ceph_deploy.osd][DEBUG ] Listing disks on XYZCeph204...
[XYZCeph204][DEBUG ] find the location of an executable
[XYZCeph204][INFO ] Running command: sudo /usr/sbin/ceph-volume lvm list
[XYZCeph204][DEBUG ] stderr: /sbin/lvs: unrecognized option '--readonly'
[XYZCeph204][WARNIN] No valid Ceph devices found
[XYZCeph204][DEBUG ] stderr: Error during parsing of command line.
[XYZCeph204][DEBUG ] stderr: /sbin/lvs: unrecognized option '--readonly'
[XYZCeph204][DEBUG ] stderr: Error during parsing of command line.
[XYZCeph204][ERROR ] RuntimeError: command returned non-zero exit status: 1
[ceph_deploy][ERROR ] RuntimeError: Failed to execute command: /usr/sbin/ceph-volume lvm list
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