I am trying to install ceph in ubuntu 16.04 by this link https://www.supportsages.com/ceph-part-5-ceph-configuration-on-ubuntu/ but when I am run this command #ceph-deploy install ceph-deploy monnode1 osd0 osd1 I am facing this error. [ceph-deploy][WARNIN] E: Sub-process /usr/bin/dpkg returned an error code (1) [ceph-deploy][ERROR ] RuntimeError: command returned non-zero exit status: 100 [ceph_deploy][ERROR ] RuntimeError: Failed to execute command: env DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get --assume-yes -q --no-install-recommends install -o Dpkg::Options::=--force-confnew ceph ceph-osd ceph-mds ceph-mon radosgw $ sudo apt-get install ceph-common Reading package lists... Done Building dependency tree Reading state information... Done ceph-common is already the newest version (12.2.12-1xenial). ceph-common set to manually installed. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 8 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y Setting up ceph-common (12.2.12-1xenial) ... Setting system user ceph properties..usermod: user ceph is currently used by process 1648 dpkg: error processing package ceph-common (--configure): subprocess installed post-installation script returned error exit status 8 dpkg: dependency problems prevent configuration of ceph-base: ceph-base depends on ceph-common (= 12.2.12-1xenial); however: Package ceph-common is not configured yet. dpkg: error processing package ceph-base (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of ceph-mds: ceph-mds depends on ceph-base (= 12.2.12-1xenial); however: Package ceph-base is not configured yet. dpkg: error processing package ceph-mds (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. No apport report written because the error message indicates its a followup error from a previous failure. dpkg: dependency problems prevent configuration of ceph-osd: ceph-osd depends on ceph-base (= 12.2.12-1xenial); however: Package ceph-base is not configured yet. dpkg: error processing package ceph-osd (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of ceph-mon: ceph-mon depends on ceph-base (= 12.2.12-1xenial); however: Package ceph-base is not configured yet. dpkg: error processing package ceph-mon (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of ceph-mgr: ceph-mgr depends on ceph-base (= 12.2.12-1xenial); however: Package ceph-base is not configured yet. dpkg: error processing package ceph-mgr (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of ceph: ceph depends on ceph-mgr (= 12.2.12-1xenial); however: Package ceph-mgr is not configured yet. ceph depends on ceph-mon (= 12.2.12-1xenial); however: Package ceph-mon is not configured yet. ceph depends on ceph-osd (= 12.2.12-1xenial); however: Package ceph-osd is not configured yet. dpkg: error processing package ceph (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of radosgw: radosgw depends on ceph-common (= 12.2.12-1xenial); however: Package ceph-common is not configured yet. dpkg: error processing package radosgw (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already Processing triggers for libc-bin (2.23-0ubuntu11) ... Errors were encountered while processing: ceph-common ceph-base ceph-mds ceph-osd ceph-mon ceph-mgr ceph radosgw E: Sub-process /usr/bin/dpkg returned an error code (1) [ceph-deploy][ERROR ] RuntimeError: command returned non-zero exit status: 100 [ceph_deploy][ERROR ] RuntimeError: Failed to execute command: env DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get --assume-yes -q --no-install-recommends install ca-certificates apt-transport-https I have wasted a lot of time with this error. Could anyone give me a solution?