Error: Unable to parse string '20' as a valid Ubuntu release version

[realBigZ]

Steps to Reproduce

These are the relevant steps I followed from here:

1. Run sudo apt install mono-complete nuget
2. Run sudo apt install autoconf autotools-dev automake cmake build-essential curl gcc g++ g++-mingw-w64 gcc-mingw-w64 git libncurses5-dev libtool libz-mingw-w64-dev libzip-dev linux-libc-dev make ninja-build p7zip-full sqlite3 vim-common zlib1g-dev linux-libc-dev:i386 zlib1g-dev:i386 libx32tinfo-dev to build xamarin-android
3. Download xamarin-android's source code git clone https://github.com/xamarin/xamarin-android.git
4. Run make prepare inside the xamarin-android folder

Expected Behavior

make prepare is supposed to build all the dependencies for xamarin-android, so I can run make jenkins and fully build xamarin-android.

Actual Behavior

Xamarin initially lists my OS as Linux Mint, but for whatever reason, Xamarin views my OS as Ubuntu later in the code:

   OS type: Linux
   OS name: Linux Mint
OS release: 20
   OS bits: x86_64
 CPU count: 2

  Error: Unable to parse string '20' as a valid Ubuntu release version

Failed to initialize operating system support
System.InvalidOperationException: Failed to initialize operating system support
  at Xamarin.Android.Prepare.OS.Init () [0x00024] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/OperatingSystems/OS.cs:243 
  at Xamarin.Android.Prepare.Context.Init (System.String scenarioName) [0x0022d] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/Application/Context.cs:766 
  at Xamarin.Android.Prepare.App.Run (System.String[] args) [0x00793] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/Main.cs:153

make: *** [Makefile:204: prepare] Error 1

Going on the latest version (11.0.0.3) produces almost identical results:

   OS type: Linux
   OS name: Linuxmint
OS release: 20
   OS bits: x86_64
 CPU count: 2

  Error: Unable to parse string '20' as a valid Ubuntu release version

Failed to initialize operating system support
System.InvalidOperationException: Failed to initialize operating system support
  at Xamarin.Android.Prepare.OS.Init () [0x00024] in /home/zola/Desktop/xamarin-android-10.3.1.4/build-tools/xaprepare/xaprepare/OperatingSystems/OS.cs:245 
  at Xamarin.Android.Prepare.Context.Init (System.String scenarioName) [0x0026c] in /home/zola/Desktop/xamarin-android-10.3.1.4/build-tools/xaprepare/xaprepare/Application/Context.cs:761 
  at Xamarin.Android.Prepare.App.Run (System.String[] args) [0x0078a] in /home/zola/Desktop/xamarin-android-10.3.1.4/build-tools/xaprepare/xaprepare/Main.cs:153 

make: *** [Makefile:202: prepare] Error 1

Version Information

The version I wish to fix this issue on is 10.3.1.4, although this issue happens with 11.0.0.3 as well.

Log File

This is the log file for 10.3.1.4 (The terminal output is here just in case):

[00:00:00.0438924] All defined properties:
[00:00:00.0636711]   AndroidCmakeVersion = 3.10.2
[00:00:00.0637333]   AndroidCmakeVersionPath = 3.10.2.4988404
[00:00:00.0637463]   AndroidLatestStableFrameworkVersion = v11.0
[00:00:00.0637557]   AndroidMxeFullPath = /usr
[00:00:00.0638016]   AndroidNdkDirectory = /home/zola/android-toolchain/ndk
[00:00:00.0638196]   AndroidSdkDirectory = /home/zola/Android/Sdk
[00:00:00.0638284]   AndroidSupportedHostJitAbis = Linux
[00:00:00.0638369]   AndroidSupportedTargetAotAbis = armeabi-v7a:arm64:x86:x86_64
[00:00:00.0638454]   AndroidSupportedTargetJitAbis = armeabi-v7a:arm64-v8a:x86:x86_64
[00:00:00.0638542]   AndroidToolchainCacheDirectory = /home/zola/android-archives
[00:00:00.0638624]   AndroidToolchainDirectory = /home/zola/android-toolchain
[00:00:00.0638712]   AutoProvision = False
[00:00:00.0639037]   AutoProvisionUsesSudo = False
[00:00:00.0639172]   CommandLineToolsFolder = 1.0
[00:00:00.0639258]   CommandLineToolsVersion = 6200805_latest
[00:00:00.0639345]   Configuration = Debug
[00:00:00.0639889]   EmulatorPkgRevision = 30.0.12
[00:00:00.0639994]   EmulatorVersion = 6466327
[00:00:00.0640076]   IgnoreMaxMonoVersion = True
[00:00:00.0640156]   IgnoreMinMonoVersion = @IgnoreMinMonoVersion@
[00:00:00.0640238]   JavaInteropFullPath = /home/zola/Desktop/xamarin-android/external/Java.Interop
[00:00:00.0640568]   JavaSdkDirectory = 
[00:00:00.0640696]   LibZipSourceFullPath = 
[00:00:00.0640782]   ManagedRuntime = mono
[00:00:00.0640861]   MingwCommandPrefix32 = i686-w64-mingw32
[00:00:00.0640940]   MingwCommandPrefix64 = x86_64-w64-mingw32
[00:00:00.0641023]   MingwDependenciesRootDirectory = /home/zola/Desktop/xamarin-android/bin/BuildDebug/mingw-deps
[00:00:00.0641113]   MingwZlibLibraryName = libz.a
[00:00:00.0641192]   MingwZlibRootDirectory32 = /usr/i686-w64-mingw32
[00:00:00.0641460]   MingwZlibRootDirectory64 = /usr/x86_64-w64-mingw32
[00:00:00.0641630]   MonoDarwinPackageUrl = https://xamjenkinsartifact.azureedge.net/build-package-osx-mono/2020-02/45/d90665a422e9f8d015585b3ca381d74faa033cc4/MonoFramework-MDK-6.12.0.43.macos10.xamarin.universal.pkg
[00:00:00.0641857]   MonoRequiredMaximumVersion = 6.12.99
[00:00:00.0641944]   MonoRequiredMinimumVersion = 6.12.0.43
[00:00:00.0642032]   MonoSourceFullPath = /home/zola/Desktop/xamarin-android/external/mono
[00:00:00.0642116]   ProductVersion = 11.1.99
[00:00:00.0642200]   RemapAssemblyRefToolExecutable = /home/zola/Desktop/xamarin-android/bin/BuildDebug/remap-assembly-ref.exe
[00:00:00.0642523]   XABinRelativeInstallPrefix = lib/xamarin.android
[00:00:00.0642661]   XABuildToolsFolder = 29.0.2
[00:00:00.0642745]   XABuildToolsVersion = 29.0.2
[00:00:00.0642833]   XAInstallPrefix = /home/zola/Desktop/xamarin-android/bin/Debug/lib/xamarin.android/
[00:00:00.0642920]   XAPackagesDir = /home/zola/Desktop/xamarin-android/packages
[00:00:00.0643008]   XAPlatformToolsPackagePrefix = 
[00:00:00.0643084]   XAPlatformToolsVersion = 30.0.2
[00:00:00.2051567] Setting condition AllowProgramInstallation to 'True'
[00:00:00.2112680] Main log file: [00:00:00.2121140] /home/zola/Desktop/xamarin-android/bin/BuildDebug/prepare-20200716T182747.log
[00:00:00.2136645] 
[00:00:00.2144446] =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[00:00:00.2153578] Detecting operating system
[00:00:00.2155641] =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[00:00:00.2157953] 
[00:00:00.3306862] Running: uname "-m"
[00:00:00.3986177] 
[00:00:00.3992715]    OS type: [00:00:00.3999262] Linux
[00:00:00.4005319]    OS name: [00:00:00.4012670] Linux Mint
[00:00:00.4018295] OS release: [00:00:00.4027067] 20
[00:00:00.4032952]    OS bits: [00:00:00.4040494] x86_64
[00:00:00.4049658]  CPU count: [00:00:00.4054127] 2
[00:00:00.4058663] 
[00:00:00.4684486] Initializing scenario Standard
[00:00:00.4935300] Windows JIT ABis DISABLED, SKIPPING MinGW dependencies build step
[00:00:00.4938637] Adding Windows GAS download step (AFTER bundle)
[00:00:00.5069311]   Error: Unable to parse string '20' as a valid Ubuntu release version
[00:00:00.5249730] 
[00:00:00.5252756] Failed to initialize operating system support
[00:00:00.5495689] System.InvalidOperationException: Failed to initialize operating system support
[00:00:00.5495689]   at Xamarin.Android.Prepare.OS.Init () [0x00024] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/OperatingSystems/OS.cs:243 
[00:00:00.5495689]   at Xamarin.Android.Prepare.Context.Init (System.String scenarioName) [0x0022d] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/Application/Context.cs:766 
[00:00:00.5495689]   at Xamarin.Android.Prepare.App.Run (System.String[] args) [0x00793] in /home/zola/Desktop/xamarin-android/build-tools/xaprepare/xaprepare/Main.cs:153 
[00:00:00.5502445]