This error is being shown whenever I want to install any software via command line. Even if i try to install softwares which I know are present at the source from where I am downloading.
Below is the full error message i am getting :
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package mysql-server is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'mysql-server' has no installation candidate
It worked for me.
If you have followed all the previous steps successfully and after running sudo apt-get install mysql-server you are getting an error then try this
sudo apt-get install mariadb-server