I am currently using Ubuntu 18.04, and I need gcc 4.8 for MATLAB. So I tried to install gcc-4.8 using
$ sudo apt-get install gcc-4.8 E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_4.15.0-117.118_amd64.deb 404 Not Found [IP: 2403:8940:3:1::f 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
so I ran the command
sudo apt-get update
I didn't show any error but running gcc version command gave this
$ gcc -v Command 'gcc' not found, but can be installed with: sudo apt install gcc
previously I used to have 7.5 but now it is not.