Ubuntu Linux 18.04LTS, command line only, newest repo done with github, sure I loaded all necessary files (sure I did), and getting these errors, as always any help would be greatly appreciated, if wrong forum sorry Admins,:

root@vps236393:~/ServUO# ./dotnet.sh
Microsoft (R) Build Engine version 16.7.1+52cd83677 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

Determining projects to restore...
All projects are up-to-date for restore.
/usr/share/dotnet/sdk/3.1.404/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks [/root/ServUO/Application/ServUO.csproj]
/usr/share/dotnet/sdk/3.1.404/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks [/root/ServUO/Server/Server.csproj]

Build FAILED.

/usr/share/dotnet/sdk/3.1.404/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks [/root/ServUO/Application/ServUO.csproj]
/usr/share/dotnet/sdk/3.1.404/Microsoft.Common.CurrentVersion.targets(1177,5): error MSB3644: The reference assemblies for .NETFramework,Version=v4.8 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks [/root/ServUO/Server/Server.csproj]
 
The error messages says you're missing the dotnet SDK (Software Development Kit) version 3.1.404 installed on your server.
 
Found another way to install it and this time everything is fixed and compiling.
thx.

Oh yeah, here is what I had to do . . .
#Register Microsoft's key
wget https://packages.microsoft.com/config/ubuntu/19.10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb

#Update your repo
sudo apt-get update

#This package is needed to be able to get repos behind an HTTPS url
sudo apt-get install apt-transport-https

#Update a second time so you get Microsoft's HTTPS repository
sudo apt-get update

#Install our package
sudo apt-get install dotnet-sdk-3.1
 
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