As of right now, you have to be running at least WINE 3.20 for the newer Star Stable Online (SSO) launcher to work. No longer works under Ubuntu 17.04 due to WINE 3.18 needing Ubuntu 18.04. My daughter's computers are running Ubuntu 18.04 as of this writing, so...
To run SSO (Star Stable Online) as of 9.14.2019, you'll need at LEAST Ubuntu 18.04,
1.) You'll need the Star Stable Online installer from https://launcher-data.starstable.com/Star+Stable+Online+Web+Setup+2.1.4.exe
note: If you login to SSO's website using a browser on linux, you'll see the message, 'You’ll need a PC or Mac to download and play the game. Head over to your computer to install the game and get started!'. That's because your webbrowser is reporting itself as a LINUX web browser. Because SSO's webserver things you are on a system their game software was not written to run on, it won't present you with a download link. The way i get around this is, i look for a 'user agent spoofer' extension for my web browser. This allows your browser to 'lie' to the SSO server and claim to be a Windows browser such as Internet Explorer. Since i prefer Chrome, i use this extension to allow me to set my browser's User Agent to 'Internet Explorer': https://chrome.google.com/webstore/detail/user-agent-switcher-for-c/djflhoibgkdhkhhcedjiklpkjnoahfmg?hl=en-US ( User-Agent Switcher for Chrome). Once SSO believes your browser is a Windows web browser, you'll be presented with the download (you have to be logged in tho to see/access it.

Once you have the installer:
1.) launchPlay On Linux (latest version you can -- i'm on 4.2.12)
2.) Use the Tools menu to run 'Manage WINE versions'. If you do not have WINE 3.18, or better (i have 3.20), select WINE version 3.18, or higher, and use the arrows to move 3.18, or higher to INSTALLED Wine versions column.
3.) In POL (Play On Linux), choose 'Install a program'
4.) At the BOTTOM of the window click on the link, 'Install a non-listed program'
5.) Read the 'Please read this' stuff, click next until you get to the 'Manual Installation window'
6.) In the Manual Installation window, click NEXT
7.) Choose 'Install a program in a new virtual drive'
8.) In 'Please type a name for your application's virtual drive. NO SPACES. I named mine, StarStable -- CLICK NEXT
9.) In the 'What would you like to do before installation?' window, check 'Use another version of Wine', and check 'Configure Wine', and check 'Install some libraries'. So, in MY version of POL, that's ALL three... then click NEXT
10.) 'Which version of Wine do you want to use?', check Wine 3.18, or HIGHER. On mine i have Wine 3.20 selected, then click NEXT
11.) 'What kind of virtual drive do you want to create?', i chose 64bit. I dont' know if you need 64bit. If it all doesn't work, start over and try 32bit LOL
12.) You'll probably see, 'Please wait while virtual drive is created', then the 'Wine Cinfiguration' SHOULD pop up.
13.) Set 'Windows Version' to Windows 10, then click OK.
14.) Now a 'Please make your choice dialog shows up', put check marks in THREE libraries... 1. 'POL_Install_dxfullsetup', 2. 'POL_Install_gecko', 3. POL_Install_mono210. Check ALL THREE and then... NEXT

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15.) If mono, and gecko, and dxfullsetup are NOT already on your system, you should see a series of windows pop up where it says it's retrieving/downloading/installing each of the three libraries we selected.. mono, gecko, dxfullsetup...

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16.) After all that clam down, you should eventually see, 'Please select the install file to run', click Browse...
17.) A file chooser dialog opens, navigate to whereever the SSO installer was downloaded to. For me, it was in Downloads and was named Star+Stable+Online+Web+Setup+2.1.4.exe
18.) Select that file and click open, or press enter...
19.) Your back at the 'Please select the install file to run' dialog, with the name of the installer showing -- click NEXT
20.) Now the actual SSO Installer should run and present you with a dialog asking for what language you want. I chose Englis, and clicked OK

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21.) Then a dialog opens asking where you want to instal to. I chose the default folder already selected. Then pressed enter, or clicked Next, or Install... it's all a blur to me now... watch as the SSO Installer works it's tedious magic..
22.) When the next dialog comes up and say 'Completing Star Stable Online Setup', >>UNCHECK<< 'Run star Stable Online'.

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23.) Since you listened... and you definitely UNCHECKED 'Run Star Stable Online', now, that you UNCHECKED that box, click Finish
24.) 'Scanning virtual drive'...
25.) 'Please choose a file for Play On Linux to make a shortcut', Scroll down to the 'Star Stable Online.exe' in the list, select it (highlighted), then click Next
26.) 'Please choose shortcut name'... i used, 'Star Stable Online'... CLICK NEXT!
27.) 'Scanning the virtual drive...'
28.) 'Please choose a file for Play On Linux to make a shortcut', scroll to TOP of the list and choose, 'I don't want to make ANOTHER shortcut'... click Next
The Play On Linux process itself is complete.
POL should have created an icon on your desktop, you can either launch that icon, or you can open Play on Linux, select 'Star Stable Online', and then click RUN.
Once SSO launches you will have to enter your SSO username and password that you created on the SSO website (or maybe you already had one)...
Once seuccessfully logged in, the larger SSO launcher window will open. It will download the game... it's a HUGE download be patient.
Once it's finished downloading (in the SSO window), the Play button will appear...
Once you click PLAY, the screen will go black for a LONG time...
It eventually opens up tho.
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