Installing gcc 4.9 & g++ 4.9 on Ubuntu 12.04 OR Ubuntu 14.04

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sudo apt-get install python-software-properties
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50
sudo apt-get install g++-4.9
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 50

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👍

doushuqi@singuloid:~$ sudo apt-get install gcc-4.9 g++-4.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
g++-4.9 : Depends: libstdc++-4.9-dev (= 4.9.3-8ubuntu214.04) but it is not going to be installed
gcc-4.9 : Depends: libgcc-4.9-dev (= 4.9.3-8ubuntu214.04) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

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Hey, just a suggestion, to avoid sudo: add-apt-repository: command not found
the first line could be updated to sudo apt-get install software-properties-common python-software-properties as in https://gist.github.com/DevipriyaSarkar/5b67f39eaead3209809aca80c6fd53a7
Thanks 👍

Unattended installation, anyone?

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