Install SDK with package manager on ubuntu

[ludovicalarcon]

Hello,

I followed the documentation to install dotnet core sdk on ubuntu 18.04 and I cannot got v2.2.207

I want install both v3.1.100 and v2.2.207 but I got the previous version instead (2.2.402).

sudo apt-get install dotnet-sdk-3.1
sudo apt-get install dotnet-sdk-2.2
dotnet --info

[dagood]

To work around the version ordering with apt, you can use = to specify the version you want:

sudo apt-get install dotnet-sdk-2.2=2.2.207-1

To see all available versions:

(as of 2019-12-20)
$ apt-cache madison dotnet-sdk-2.2
dotnet-sdk-2.2 |  2.2.402-1 | ...
dotnet-sdk-2.2 |  2.2.401-1 | ...
dotnet-sdk-2.2 |  2.2.301-1 | ...
dotnet-sdk-2.2 |  2.2.300-1 | ...
dotnet-sdk-2.2 |  2.2.207-1 | ...
...
dotnet-sdk-2.2 |  2.2.102-1 | ...
dotnet-sdk-2.2 |  2.2.101-1 | ...
dotnet-sdk-2.2 |  2.2.100-1 | ...

The one you get without specifying a version follows the version number order with no understanding of the SDK's 1xx/2xx/3xx... "product bands", so you end up with 2.2.402-1 by default.

This is a problem, but I don't know a great way to solve it. It also means apt upgrade isn't working for 2.2 builds.

Our RPM packages have the same issue. (The workaround there uses - instead of =.)

(There's more on why new SDKs weren't released for the higher product bands at dotnet/core#3848, but it sounds like you're already aware of that.)

@leecow @vivmishra @dleeapho Do we know what we're going to do with this problem for the Linux packages?

[ludovicalarcon]

Thanks for the work around and all the explanation.