Dependency Problem With Mongo When Installing Unifi

Question

I'm trying to install the Unifi software on Ubuntu 18.04. The guide I'm following is from the developers of Unifi in the link below:

https://help.ubnt.com/hc/en-us/articles/220066768-UniFi-How-to-Install-and-Update-via-APT-on-Debian-or-Ubuntu

The problem I've got is that I get numerous dependency problems when trying to install the software. In the guide, I get to the point where I run the command below when I run into errors:

$ sudo apt install unifi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 unifi : Depends: mongodb-server (< 1:3.6.0) but 1:3.6.3-0ubuntu1 is to be installed or
                  mongodb-10gen (< 3.6.0) but it is not installable or
                  mongodb-org-server (< 3.6.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
server@Server:~$ sudo apt remove unifi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package 'unifi' is not installed, so not removed
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.

I've tried purging and removing anything and everything to do with mongodb and I still get this same problem at the end. Need some advice on how to get this fixed.

Answer 1

Recently installed unifi controller on 20.04 LTS Server and this was handy reference:

https://gist.github.com/davecoutts/5ccb403c3d90fcf9c8c4b1ea7616948d

As following the unifi guide I was getting an error with starting the service, which looked to me from the JDK. Either way the tasks in the script resolved my issue.

Answer 2

I am having the same issue, which is the mongodb-server has to be LESS than 3.6.0 and Ubuntu 18.04 only has the 3.6.3 version to install.

I believe these instructions should work for you, which adds sources to install an "older" version of mongodb-server and the unifi controller:

https://help.ubnt.com/hc/en-us/articles/220066768-UniFi-How-to-Install-Update-via-APT-on-Debian-or-Ubuntu

At least it worked for me.

Answer 3

The easiest way is to follow steps on the site of Ubiquiti.

Before you install it though, download and install mongodb community version 3.4.23. I took the one for Ubuntu 16.04, still works on 18.04; you can download at this link.

After download, run the following command and you should be good to go to install Unifi

sudo dpkg -i mongodb-org-server_3.4.23_amd64.deb