Can not install Java [duplicate]

Question

sudo add-apt-repository ppa:ferramroberto/java

After this command I am getting error:

Error reading https://launchpad.net/api/1.0/~ferramroberto/+archive/java: Couldn't resolve host 'launchpad.net

What's your output for ping launchpad.net?
– pzkpfw
May 16, 2013 at 7:00 — pzkpfw, May 16, 2013 at 7:00
ppa:ferramroberto - in not a good repository
– Radu Rădeanu
May 16, 2013 at 7:18 — Radu Rădeanu, May 16, 2013 at 7:18

Kevin Bowen · Accepted Answer · 2013-05-16 10:38:52Z

To add our PPA and install the latest Oracle Java (JDK) 7 in Ubuntu, use the commands below:

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update && sudo apt-get install oracle-jdk7-installer

After the installation you have enable the jdk:
```
update-alternatives –display java
```
Check if Ubuntu uses Java JDK 7
```
java -version
```
The correct answer should be like this:
```
javac 1.7.0_07
```
Adding JAVA_HOME to environment

Edit the file /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file.

First open a Terminal (Applications → Accessories → Terminal), then enter:
```
sudo gedit /etc/environment
```

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