What's up with the mongodb errors? How to fix it?

I am new to Linux. In General a couple of days as you get used to. Today tried to install mongodb in this guide and kind of did, it works.
However, when I do in terminal sudo apt-get update get the following error
W: The repository 'http://repo.mongodb.org/apt/ubuntu serena/mongodb-org/Release 3.0' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://repo.mongodb.org/apt/ubuntu/dists/serena/mongodb-org/3.0/multiverse/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.


Update Manager in the tray screams 'Could not refresh a list of updates'. When I I press Refresh, it gives me
Could not download all repository indexes
The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.

The repository 'repo.mongodb.org/apt/ubuntu serena/mongodb-org/Release 3.0' does not have a Release file.Data from such a repository can't be authenticated and is therefore potentially dangerous to use.See apt-secure(8) manpage for repository creation and user configuration details.Failed to fetch repo.mongodb.org/apt/ubuntu/dists/serena/mongodb-o... 404 Not FoundSome index files failed to download. They have been ignored, or old ones used instead.

What I need to do something to get rid of these messages to the update manager could automatically do refresh?
June 27th 19 at 15:31
2 answers
June 27th 19 at 15:33
Solution
This repository has no packages for 32-bit as such. Hence the error. You can't fix so https://docs.mongodb.com/manual/tutorial/install-m...
MongoDB only provides packages for 64-bit LTS (long term support) releases of Ubuntu... - Dianna.Harris commented on June 27th 19 at 15:36
I installed for 32-bit and I have actually all works.
I just want that the Update Manager could do the refresh for updates, and don't complained to me about it.
What should I do? To remove something, to change something? What to do? - Dianna.Harris commented on June 27th 19 at 15:39
June 27th 19 at 15:35
well-what to do? can someone help...
To migrate to a 64-bit system. Mongodb has long been a focus on care from 32-bit, aware about all the limitations of 32-bit systems in terms of memory. Why not solve the problem just through the package Manager, no repository, - you have already answered, there are no packages in the repositories for this architecture. Nothing can be done to get rid of these messages, in addition to creating a private repository, you need hands to put fresh packages. I seriously doubt that you need it, especially if you consider that you are new to Linux and a couple of days as you get used to. Even so I would not become puzzled in this case, and I have more than 12 years on it. Why do you want to sit on a 32-bit system in 2017 - is unclear. - Dianna.Harris commented on June 27th 19 at 15:38

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