Cannot install dotnet SDK on Ubuntu 21.04

So, I’ve been using .net core previously on Ubuntu. It was 3.1. I don’t remember how exactly it was installed but it worked perfectly.

Now when I’d reinstalled my system to Ubuntu 21.04 I was going to give .net 5.0 a try. Unfortunately all installation options mentioned on official Microsoft website (https://docs.microsoft.com/en-us/dotnet/core/install/linux) failed for me.

• Snap installation itself worked fine. I was able to install .net 5.0. But almost any dotnet CLI call fails with Segmentation Fault. This seams to be a known issue, some people recommend to not use Snap for dotnet. It worths mentioning that I’ve also tried 3.1 channel and it gives the same result - segmentation fault.
• My second option was to use install.sh, but this is not recommended for development environment installation, so I didn’t even try.
• Some people on the internet recommend to use Microsoft PPA and to install deb packages. While this option is still present on official documentation (https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#2104-), it seems like Microsoft team abandoned it’s PPA. https://packages.microsoft.com/config/ubuntu/21.04/packages-microsoft-prod.deb - gives 404. The same happens if I add PPA manually and try to install dotnet

$ sudo apt install  dotnet-sdk-5.0 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  aspnetcore-runtime-5.0 aspnetcore-targeting-pack-5.0 dotnet-apphost-pack-5.0 dotnet-host dotnet-hostfxr-5.0 dotnet-runtime-5.0 dotnet-runtime-deps-5.0 dotnet-targeting-pack-5.0
  netstandard-targeting-pack-2.1
The following NEW packages will be installed:
  aspnetcore-runtime-5.0 aspnetcore-targeting-pack-5.0 dotnet-apphost-pack-5.0 dotnet-host dotnet-hostfxr-5.0 dotnet-runtime-5.0 dotnet-runtime-deps-5.0 dotnet-sdk-5.0 dotnet-targeting-pack-5.0
  netstandard-targeting-pack-2.1
0 upgraded, 10 newly installed, 0 to remove and 24 not upgraded.
Need to get 95,1 MB of archives.
After this operation, 396 MB of additional disk space will be used.
Do you want to continue? [Y/n] 
Err:1 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-runtime-deps-5.0 amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:2 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-host amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:3 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-hostfxr-5.0 amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:4 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-runtime-5.0 amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:5 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 aspnetcore-runtime-5.0 amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:6 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-targeting-pack-5.0 amd64 5.0.0-1
  404  Not Found [IP: 104.214.230.139 443]
Err:7 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 aspnetcore-targeting-pack-5.0 amd64 5.0.0-1
  404  Not Found [IP: 104.214.230.139 443]
Err:8 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-apphost-pack-5.0 amd64 5.0.7-1
  404  Not Found [IP: 104.214.230.139 443]
Err:9 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 netstandard-targeting-pack-2.1 amd64 2.1.0-1
  404  Not Found [IP: 104.214.230.139 443]
Err:10 https://packages.microsoft.com/ubuntu/21.04/prod hirsute/main amd64 dotnet-sdk-5.0 amd64 5.0.301-1
  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-runtime-deps-5.0/dotnet-runtime-deps-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-host/dotnet-host-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-hostfxr-5.0/dotnet-hostfxr-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-runtime-5.0/dotnet-runtime-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/a/aspnetcore-runtime-5.0/aspnetcore-runtime-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-targeting-pack-5.0/dotnet-targeting-pack-5.0.0-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/a/aspnetcore-targeting-pack-5.0/aspnetcore-targeting-pack-5.0.0.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-apphost-pack-5.0/dotnet-apphost-pack-5.0.7-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/n/netstandard-targeting-pack-2.1/netstandard-targeting-pack-2.1_2.1.0-1_amd64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Failed to fetch https://packages.microsoft.com/ubuntu/21.04/prod/pool/main/d/dotnet-sdk-5.0/dotnet-sdk-5.0.301-x64.deb  404  Not Found [IP: 104.214.230.139 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

To summarize, I was not able to install ANY version of .net core using any of suggested approaches. So it there any way to install dotnet on Ubuntu?

[stepanprokipchyn]

I was finally able to install on my side. It was very slow and it interrupted a few times. Seems like the installed sdk is working, at least I don’t get Segfault

[ozonni]

same here for Ubuntu 18.04: https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb