[Ubuntu] apt-get: Package has no installation candidate
注：以下命令可能需要sudo
If the package name does not exist in APT’s database, it does not have any idea what you are trying to install and you see the following error message:
# apt-get install <packagename>
Reading package lists... Done
Building dependency tree... Done
Package aptitude 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 <packagename> has no installation candidate
So, the above error occurs for 2 reasons:
1) The APT’s database is not updated.
A quick fix is to update the APT’s database as per the defined sources list.
# apt-get update
# apt-get upgrade
# apt-get install <packagename>
This is it. If isn’t fixed, check point #2 below.
2) The package itself isn’t available on the official Ubuntu repository.
In such a situation, you have to add a 3rd party repository to your /etc/apt/sources.list file and install the package, however, try such repositories at your own risk.
