当我尝试在Ubuntu 18.04 m中安装JAVA 7时遇到一些问题

Question

Package oracle-java7-installer is not available , but is referred to by another package. This may mean that the package is missing ,that has been obsoleted, or is only available from another source

Answer 1

As of March 22, 2019, it appears that oracle-java7-installer is no longer available from the ppa:webupd8team/java upstream repo (it could be that it got move to a different archive repo).

Alternatively, you can install oracle-java8-installer instead if you have the apt repo setup properly.

Previously its work with below steps-

Oracle JDK 6 and 7 are not available by default in Ubuntu 18.04/16.04 repositories and requires you to add repositories for the same as follows:

$ sudo add-apt-repository ppa:webupd8team/java (If you find upstream repo Update on this line and follw below steps)

$ sudo apt-get update

You may now run your command and enjoy using Java.

If you get error while installing ppa:repository, you will need to re-install ca certificates as follows:

$ sudo apt-get install --reinstall ca-certificates

Once this is done try running first two commands again.

Answer 2

oracle-java7-installer is no longer available from their ppa:webupd8team/java repository, and that would make sense now that Java 8 is out. Try installing Java 8 and see if the problem still persists.