sudo apt-get install phpmyadmin
komutu şu hatayı veriyor: Package phpmyadmin 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 ‘phpmyadmin’ has no installation candidate
Not: Preloader kurmak istediğimde de E: Unable to locate package preloader
Bu tür durumlarda genel olarak ne yapmak gerek?