E: Package 'cassandra' has no installation candidate when installing Cassandra-CodePudding

I was trying to uninstall and reinstall Cassandra on my Ubuntu system however in an attempt to cleanup I deleted file names with cassandra in it, and accidentally deleted requisite file including the /etc/apt/sources.list.d/cassandra.sources.list file. And now when I try to install Cassandra using the command sudo apt-get install cassandra, it gives the error E: Package 'cassandra' has no installation candidate. How can I fix this?

I ran sudo apt-get update and the cassandra.sources.list file seems to have come back, with content deb [arch=amd64] https://downloads.apache.org/cassandra/debian 311x main but it still gives same error on trying to install cassandra

CodePudding user response：

I was able to follow the documentation to install cassandra, the only thing that I adjusted was the curl -L flag but apart from that this can solve your problem.

$ echo "deb http://www.apache.org/dist/cassandra/debian 40x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
deb http://www.apache.org/dist/cassandra/debian 40x main

# Make sure the `cassandra.sources.list` file has only this single line.

$ sudo cat /etc/apt/sources.list.d/cassandra.sources.list
deb http://www.apache.org/dist/cassandra/debian 40x main

$ curl -L https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   227  100   227    0     0   4283      0 --:--:-- --:--:-- --:--:--  4283
100  267k  100  267k    0     0   296k      0 --:--:-- --:--:-- --:--:--  296k
OK

$ sudo apt-get update
$ sudo apt-get install cassandra

CodePudding user response：

This error indicates that APT was not able to find a source for the package:

E: Package 'cassandra' has no installation candidate

The cause for the error is that you added the wrong repository in your sources:

deb [arch=amd64] https://downloads.apache.org/cassandra/debian 311x main

If you have a look at the Cassandra installation document I wrote on the Apache website, the correct repository is www.apache.org/dist/cassandra/debian.

If you want to install Cassandra 3.11, You need to delete your source and update it with:

$ sudo rm /etc/apt/sources.list.d/cassandra.sources.list
$ echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list

You'll need to follow the document above to add the repo keys and update the package index on your server. Then to install C* 3.11.11 (for example), run:

$ sudo apt-get install cassandra=3.11.11-1

You'll need to adapt the command above to the specific version you want to install. Otherwise, APT will attempt to install the latest version. Cheers!