.Net Core on Ubuntu 18.04 stuck on setup (also on 16.04)

I am attempting to install .Net Core Framework on Ubuntu 18.04.

I am following the guide from Microsoft: https://docs.microsoft.com/en-us/dotnet/core/install/linux-package-manager-ubuntu-1804

Sadly the installation is stuck here

dotnet-sdk-3.1 (3.1.101-1) wird eingerichtet ...
This software may collect information about you and your use of the software, and send that to Microsoft.
Please visit http://aka.ms/dotnet-cli-eula for more information.
Welcome to .NET Core!
---------------------
Learn more about .NET Core: https://aka.ms/dotnet-docs
Use 'dotnet --help' to see available commands or visit: https://aka.ms/dotnet-cli-docs

Telemetry
---------
The .NET Core tools collect usage data in order to help us improve your experience. The data is anonymous and doesn't include command-line arguments. The data is collected by Microsoft and shared with the community. You can opt-out of telemetry by setting the DOTNET_CLI_TELEMETRY_OPTOUT environment variable to '1' or 'true' using your favorite shell.

Read more about .NET Core CLI Tools telemetry: https://aka.ms/dotnet-cli-telemetry

Configuring...
--------------
A command is running to populate your local package cache to improve restore speed and enable offline access. This command takes up to one minute to complete and only runs once.

Any ideas?

htop ist showing the following process permanently at 3-4% CPU

/usr/share/dotnet exec /usr/share/dotnet/sdk/3.1.101/dotnet.dll internal-reportinstallsuccess debianpackage

Interestingly, when checking dotnet status it shows this

root@xxx:~# dotnet --info
.NET Core SDK (gemäß "global.json"):
 Version:   3.1.101
 Commit:    b377529961

Laufzeitumgebung:
 OS Name:     ubuntu
 OS Version:  18.04
 OS Platform: Linux
 RID:         ubuntu.18.04-x64
 Base Path:   /usr/share/dotnet/sdk/3.1.101/

Host (useful for support):
  Version: 3.1.1
  Commit:  a1388f194c

.NET Core SDKs installed:
  3.1.101 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.App 3.1.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

But apt is blocked, if trying to upgrade packages I get

root@xxx:~# apt upgrade
E: Der dpkg-Prozess wurde unterbrochen; Sie müssen manuell »dpkg --configure -a« ausführen, um das Problem zu beheben.

Which then is followed by the same

root@xxx:/usr/share/dotnet# dpkg --configure -a
dotnet-sdk-3.1 (3.1.101-1) wird eingerichtet ...
This software may collect information about you and your use of the software, and send that to Microsoft.
Please visit http://aka.ms/dotnet-cli-eula for more information.
Welcome to .NET Core!
---------------------
Learn more about .NET Core: https://aka.ms/dotnet-docs
Use 'dotnet --help' to see available commands or visit: https://aka.ms/dotnet-cli-docs

Telemetry
---------
The .NET Core tools collect usage data in order to help us improve your experience. The data is anonymous and doesn't include command-line arguments. The data is collected by Microsoft and shared with the community. You can opt-out of telemetry by setting the DOTNET_CLI_TELEMETRY_OPTOUT environment variable to '1' or 'true' using your favorite shell.

Read more about .NET Core CLI Tools telemetry: https://aka.ms/dotnet-cli-telemetry

Configuring...
--------------
A command is running to populate your local package cache to improve restore speed and enable offline access. This command takes up to one minute to complete and only runs once.

[PerryBruins]

Update from Strato: it should work on Virtuozzo, but for security reasons we have disabled Some features used by dotnet which Might impact your installation. Duh!

Since this is clearly a helpdesk answer, i did ask for more clarification on which features. I’ll keep you posted.

[PerryBruins]

Last update from my side: After asking on the disabled features I got the following answer (translated from Dutch):

“The SDK installer tries to configure the virtual network interface, which we do not allow. Our advice is to use a “rootserver” (whatever that may mean) or a Windows VE (VE?).”

Since I am now happily using the dotnetcore 3.1 runtime environment, I will stop investigating the matter. Thanks for thinking with me!