Unable to install CMake as not supported

Hardware
1

I’m trying to download CMake from the software center where its source is listed as pureos-green-main but I get an error ‘unable to install CMake as not supported’ when trying to download & install it. Is this right? I need CMake to compile an R package, nloptr, it seems.

2

Hi @fredbastiat,

Is your system up-to-date? See the wiki entry about performing a system update.

If it is already up to-date, can you paste here the error message you get?

3

I went to the wiki and tried the instructions.

sudo apt update gives me an error message too:

‘Err:6 http://mirrordirector.raspbian.org/raspbian stretch InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9165938D90FDDD2E
Reading package lists… Done
W: GPG error: http://mirrordirector.raspbian.org/raspbian stretch InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 9165938D90FDDD2E
E: The repository ‘http://mirrordirector.raspbian.org/raspbian stretch InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.’

When I try to install CMake in the software center default application, it wants me to ‘enable third-party software source’. When I click enable and install (The exact prompt is: CMake is provided by “pureos-green-main”. This software source must be enabled to continue installation.) is when I get the exact error message: ‘unable to install cmake as not supported’.

A few other small details: The CMake package as being 0 bytes in the software center GUI and “pureos-green-main” is underlined as though it is a hyperlink but there is no link. Using sudo apt upgrade after sudo apt update (which fails with error mentioned above) updated nodejs and slack on my computer.

4

Do you run PureOS? It seems you have raspbian repositories in your apt list.

You might be interested in the software sources wiki article.

What does the following command output?

cat /etc/apt/sources.list
5

Thank you. I had raspbian software sources and not pureOS default sources on.