I just did a wine Install on Ubuntu 16.04 and got the dialogue "We can install Mono and Gecko but recommend you do it the proper way". I hit the cancel button figuring I'll install them later. Do I need to actually do this and what's the best way?

I use all kinds of legacy Windows apps that aren't available on Linux.

3 Answers 3



You need Mono to run certain applications and components.

It is recommended to install the Microsoft core fonts, some applications require it to work properly.

I suggest you to install PlayOnLinux, so you can manage your Wine prefixes easily by installing the components required for each one.

For example, if you want to install Microsoft Office, PlayOnLinux already has a script which automatically installs the required complements and packages.

You can install mono by using:

sudo apt install mono-complete

or (for Ubuntu versions prior to 16.04)

sudo apt-get install mono-complete


For Gecko, check https://wiki.winehq.org/Gecko

  • 1
    Can I install gecko by running sudo apt install wine-gecko2.21?
    – geras
    Aug 9, 2018 at 11:07
  • 1
    Yes, you can. Also check this: Wine-Gecko
    Aug 9, 2018 at 17:58

To ignore Mono and Gecko popup, you can export the following variable before running your app:

export WINEDLLOVERRIDES="mscoree,mshtml="

If you do that, rendering of HTML is going to be disabled in some apps.

See: How to disable Gecko package popup for Wine?

Alternatively install Gecko by: sudo apt-get install wine-gecko\*.

And .NET library by via winetricks:

sudo apt-get install winetricks
winetricks dotnet45

See: Why is Wine not seeing that I have mono 3 installed?

  • The suggested alternative Gecko command, entered exactly as stated, now produces "Unable to locate package wine-gecko*" Sep 7, 2021 at 23:17

Other answers were not working for me on 18.04 LTS with winehq-stable package. I needed .NET framework packages to run a certain application, so I did not need Mono in particular, just something that would run C# programs.

The workaround I found was to recreate wine32 and wine64 prefixes and install .NET on those with the automatic prompt of winetricks.

    # Create dir for 32 bit prefix
    mkdir ~/.wine32
    # destroy default configuration (64 bit prefix)
    rm -rf ~/.wine 

    # Initial setup (create prefixes)
    WINEPREFIX="$HOME/.wine32" WINEARCH=win32 wine wineboot
    WINEPREFIX="$HOME/.wine" WINEARCH=win64 wine64 wineboot

    # To install dotnet35 on 32-bit prefix
    WINEPREFIX="$HOME/.wine32" WINEARCH=win32 winetricks dotnet35

  • I get the error 005c:err:mscoree:CLRRuntimeInfo_GetRuntimeHost Wine Mono is not installed after following your steps.
    – Jaime M.
    Dec 11, 2019 at 9:19
  • Thank you for your comment. The answer now specifies that I needed .NET and not exactly Mono. I did knew that the latter is a free implementation of the first, but I do not know of any Windows application that requires Mono specifically and not .NET, so can't help you without any more details. In general I believe if you installed .NET you should not have any particular problem (apart from common wine bugs in running applications), which I can't help you with since I am not a Wine developer. Dec 11, 2019 at 16:36

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