How to Install GCC on Ubuntu 25.10

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GCC (GNU Compiler Collection) is a key development toolchain capable of compiling C, C++, Fortran, and other programming languages. It handles compilation, linking, and preparation of binary executables or libraries.

Ubuntu 25.10 "Questing Quokka" supports many versions of GCC — version 11 through 15 are available, and GCC 15 is included in the archive.

Here’s how to install the latest supported version of GCC on Ubuntu 25.10.

Update System

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First, refresh your package index and upgrade packages:

sudo apt update
sudo apt upgrade -y

Install GCC (Latest Version Available)

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Install build-essential which pulls in GCC, G++, make, and other tools:

sudo apt install build-essential

Optionally install specific version (for example GCC 15) if you want the very newest major version:

sudo apt install gcc-15 g++-15

Verify GCC Version

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To check which version of gcc is active:

gcc --version

Output:

gcc (Ubuntu 15.2.0-4ubuntu2) 15.2.0

Compiling a Hello World Example

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Create a simple C program named hello.c:

nano hello.c

Add:

#include <stdio.h>

int main() {
    printf("Hello, world!\n");
    return 0;
}

Compile it:

gcc -o hello hello.c

Run it:

./hello

Output:

Hello, world!

Conclusion

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You have successfully installed a modern GCC toolchain on Ubuntu 25.10.
You are now ready to compile C/C++ programs, use newer language standards, and build software on your system.