Example for mongo-org-unstable-server not conflicting with mongodb-server: vagrant@precise64:~$ sudo apt-get install mongodb-server Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: libboost-filesystem1.46.1 libboost-program-options1.46.1 libboost-system1.46.1 libboost-thread1.46.1 libpcrecpp0 mongodb-clients The following NEW packages will be installed: libboost-filesystem1.46.1 libboost-program-options1.46.1 libboost-system1.46.1 libboost-thread1.46.1 libpcrecpp0 mongodb-clients mongodb-server 0 upgraded, 7 newly installed, 0 to remove and 154 not upgraded. Need to get 20.9 MB of archives. After this operation, 50.8 MB of additional disk space will be used. Do you want to continue [Y/n]? Get:1 http: //us.archive.ubuntu.com/ubuntu/ precise/main libpcrecpp0 amd64 8.12-4 [16.2 kB] Get:2 http: //us.archive.ubuntu.com/ubuntu/ precise/universe libboost-system1.46.1 amd64 1.46.1-7ubuntu3 [14.6 kB] Get:3 http: //us.archive.ubuntu.com/ubuntu/ precise/universe libboost-filesystem1.46.1 amd64 1.46.1-7ubuntu3 [50.7 kB] Get:4 http: //us.archive.ubuntu.com/ubuntu/ precise/main libboost-program-options1.46.1 amd64 1.46.1-7ubuntu3 [146 kB] Get:5 http: //us.archive.ubuntu.com/ubuntu/ precise/universe libboost-thread1.46.1 amd64 1.46.1-7ubuntu3 [39.5 kB] Get:6 http: //us.archive.ubuntu.com/ubuntu/ precise-updates/universe mongodb-clients amd64 1:2.0.4-1ubuntu2.1 [16.5 MB] Get:7 http: //us.archive.ubuntu.com/ubuntu/ precise-updates/universe mongodb-server amd64 1:2.0.4-1ubuntu2.1 [4,167 kB] Fetched 20.9 MB in 3s (6,317 kB/s) Selecting previously unselected package libpcrecpp0. (Reading database ... 51095 files and directories currently installed.) Unpacking libpcrecpp0 (from .../libpcrecpp0_8.12-4_amd64.deb) ... Selecting previously unselected package libboost-system1.46.1. Unpacking libboost-system1.46.1 (from .../libboost-system1.46.1_1.46.1-7ubuntu3_amd64.deb) ... Selecting previously unselected package libboost-filesystem1.46.1. Unpacking libboost-filesystem1.46.1 (from .../libboost-filesystem1.46.1_1.46.1-7ubuntu3_amd64.deb) ... Selecting previously unselected package libboost-program-options1.46.1. Unpacking libboost-program-options1.46.1 (from .../libboost-program-options1.46.1_1.46.1-7ubuntu3_amd64.deb) ... Selecting previously unselected package libboost-thread1.46.1. Unpacking libboost-thread1.46.1 (from .../libboost-thread1.46.1_1.46.1-7ubuntu3_amd64.deb) ... Selecting previously unselected package mongodb-clients. Unpacking mongodb-clients (from .../mongodb-clients_1%3a2.0.4-1ubuntu2.1_amd64.deb) ... Selecting previously unselected package mongodb-server. Unpacking mongodb-server (from .../mongodb-server_1%3a2.0.4-1ubuntu2.1_amd64.deb) ... Processing triggers for man-db ... Processing triggers for ureadahead ... ureadahead will be reprofiled on next reboot Setting up libpcrecpp0 (8.12-4) ... Setting up libboost-system1.46.1 (1.46.1-7ubuntu3) ... Setting up libboost-filesystem1.46.1 (1.46.1-7ubuntu3) ... Setting up libboost-program-options1.46.1 (1.46.1-7ubuntu3) ... Setting up libboost-thread1.46.1 (1.46.1-7ubuntu3) ... Setting up mongodb-clients (1:2.0.4-1ubuntu2.1) ... Setting up mongodb-server (1:2.0.4-1ubuntu2.1) ... Adding system user `mongodb' (UID 106) ... Adding new user `mongodb ' (UID 106) with group `nogroup' ... Not creating home directory `/home/mongodb'. Adding group `mongodb' (GID 111) ... Done. Adding user `mongodb ' to group `mongodb' ... Adding user mongodb to group mongodb Done. mongodb start/running, process 1676 Processing triggers for libc-bin ... ldconfig deferred processing now taking place vagrant@precise64:~$ sudo apt-get install mongodb-org-unstable-server Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: mongodb-org-unstable-server 0 upgraded, 1 newly installed, 0 to remove and 154 not upgraded. Need to get 8,094 kB of archives. After this operation, 20.6 MB of additional disk space will be used. Get:1 http: //distro-deb2.build.10gen.cc/rebrand/ubuntu-upstart/ dist/mongodb mongodb-org-unstable-server amd64 2.5.2 [8,094 kB] Fetched 8,094 kB in 1s (6,291 kB/s) Selecting previously unselected package mongodb-org-unstable-server. (Reading database ... 51166 files and directories currently installed.) Unpacking mongodb-org-unstable-server (from .../mongodb-org-unstable-server_2.5.2_amd64.deb) ... dpkg: error processing / var /cache/apt/archives/mongodb-org-unstable-server_2.5.2_amd64.deb (--unpack): trying to overwrite '/usr/bin/mongod' , which is also in package mongodb-server 1:2.0.4-1ubuntu2.1 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Errors were encountered while processing: / var /cache/apt/archives/mongodb-org-unstable-server_2.5.2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1)