Hi, i am getting below error while trying to upgrade gcc,

1. How To Install Gcc On Ubuntu
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3. How To Install Gcc In Ubuntu Mac
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root@compute:/tmp# sudo apt-get update &&

sudo apt-get install build-essential software-properties-common -y &&
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
sudo apt-get update &&
sudo apt-get install gcc-snapshot -y &&
sudo apt-get update &&
sudo apt-get install gcc-6 g++-6 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 &&
-sudo apt-get install gcc-4.8 g++-4.8 -y &&
-sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;
Hit:1 http://ppa.launchpad.net/ubuntu-toolchain-r/ppa/ubuntu xenial InRelease
Ign:2 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton InRelease
Hit:3 http://in.archive.ubuntu.com/ubuntu xenial InRelease
Hit:4 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial InRelease
Hit:5 http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/newton Release
Get:7 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Get:8 http://in.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Get:9 http://in.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Fetched 306 kB in 1s (199 kB/s)
Reading package lists.. Done
Reading package lists.. Done
Building dependency tree
Reading state information.. Done
build-essential is already the newest version (12.1ubuntu2).
build-essential set to manually installed.
software-properties-common is already the newest version (0.96.20.4).
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
cpp-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
g++-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
gcc-5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libasan2 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libatomic1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libcc1-0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libcilkrts5 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libgcc-5-dev : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libgomp1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libitm1 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
liblsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libmpx0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libquadmath0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libstdc++-5-dev : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libstdc++-5-dev:i386 : Depends: gcc-5-base:i386 (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libgcc-5-dev:i386 (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libstdc++6:i386 (>= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
Depends: libc6-dev:i386 (>= 2.13-0ubuntu6) but it is not going to be installed
libstdc++6 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libtsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
libubsan0 : Depends: gcc-5-base (= 5.4.0-6ubuntu116.04.2) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

please help me to short it out.

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Ubuntu 9.10 Karmic: You already have the excellent gcc-4.4.1 as the default compiler. So why use version 4.4.3?? The install method recommended by the gcc people. Sudo yum install g++ Installing Code::Blocks. Fortunately for all concerned, an Ubuntu-ready version of Code::Blocks is available in the Ubuntu Software Center. Many other versions of Linux include something similar to the Software Center. Follow these steps to install Code::Blocks: Click on the Software Center icon on the Ubuntu desktop.

I'm trying to run a test under GCC 7. According to How to install gcc-7 or clang 4.0? on Ubuntu.SE, we can perform the following to install GCC 7 on Ubuntu:

The command fails at the install:

And trying 7.1:

According to List all packages from a repository in ubuntu / debian on Server Fault, we can search a particular repo for a package with:

But I am not sure if the command above is searching ppa:ubuntu-toolchain-r.

I kind of pieced things together, but they are not working as expected. Either the Ubuntu.SE answer is wrong, the Server Fault search is failing, or I am doing something wrong.

(I don't have a Debain 8 machine available for gcc-7 package, and Fedora 25 appears to lack GCC 7. So I am pretty much stuck with Ubuntu).

How To Install Gcc On Ubuntu

What am I doing wrong? Or, how can I install GCC 7?

3 Answers

To install gcc-7 on ubuntu you should use this ppa:

Then run: apt-cache search gcc-7

How To Install Gcc In Ubuntu Using Terminal

sample output :

Install gcc-7:

Ubuntu 18.04 has both GCC 7 (7.3.0-16ubuntu3, at the moment I am writing this answer) and GCC 8 (8-20180414-1ubuntu2). There isn't anymore the need of adding third-party repositories: Just run sudo apt-get install gcc-7.

How To Install Gcc In Ubuntu Mac

If you need to setup a test rig with the compiler, then Fedora 26 ships with GCC 7.1.

Install Gcc Make Perl Ubuntu

You can also find GCC 7 in Debian 10/Buster (Debian 9 with Testing repo enabled). For Debian, you must apt-get install gcc-7 g++-7.

For completeness, its not clear which version of the Microsoft compilers support C++17 and std::byte (the reason I needed the compiler for testing).

And thanks to GAD3R for his help. The reason I avoided it was I could not establish provenance for some of the PPAs.