How to install GCC with deb?

The package management system in Ubuntu keeps track of all mutual dependencies between packages. If you cannot connect to the internet, but want to install packages manually, then you have to take care yourself, that all dependencies are met.

You want to install the gcc package.
You have already found the page https://packages.ubuntu.com/bionic-updates/devel/gcc
This page tells (with red dots) that for installing this version of gcc, you need to have installed cpp and gcc-7.
cpp in turn depends on cpp-7 which in turn depends on gcc-7-base and some other packages.

So this can be a very long chain of dependencies. You have to download all those packages (in *.deb format) and install them on your system if you do not yet have them installed.

For installation of the packages you can e.g. use the command "sudo dpkg --install package1.deb package2.deb …"
If you are missing a dependency, then you will receive an error message for this command.

It probably would be easier to connect this system to the internet (at least temporarily) for an automatic resolving of dependencies.

Compile gcc with source code or deb? Ubuntu18.04 LTS offline installation Is there a gcc compiler?

If I want to download libc6 (>= 2.14) [amd64] where to download

I am quite sure, that you have libc6 already installed.
What is the output of the command

dpkg -l libc6
apt-cache policy libc6

"deb" files contain precompiled software. If you install the gcc deb file, then there should not be a need for compiling it from source.

What exactly do you want to achieve?

于 November 18, 2018 10:27:45 AM UTC, Manfred Hampl <email address hidden> 写到:
> Your question #676229 on gcc-defaults in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gcc-defaults/+question/676229
>
> Manfred Hampl requested more information:
> I am quite sure, that you have libc6 already installed.
> What is the output of the command
>
> dpkg -l libc6
> apt-cache policy libc6
>
> "deb" files contain precompiled software. If you install the gcc deb
> file, then there should not be a need for compiling it from source.
>
> What exactly do you want to achieve?

I just don't understand, the deb file is very small, no gcc source package size is large, solve the gcc deb dependent file can successfully install gcc?

于 November 18, 2018 10:27:45 AM UTC, Manfred Hampl <email address hidden> 写到:
> Your question #676229 on gcc-defaults in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gcc-defaults/+question/676229
>
> Manfred Hampl requested more information:
> I am quite sure, that you have libc6 already installed.
> What is the output of the command
>
> dpkg -l libc6
> apt-cache policy libc6
>
> "deb" files contain precompiled software. If you install the gcc deb
> file, then there should not be a need for compiling it from source.
>
> What exactly do you want to achieve?

Brother, I really want to install gcc through deb, but I don't know how to install gcc compiler to learn c language, because my computer has no network, so I can't install gcc through apt get. To be honest, this is very inconvenient. Can you provide gcc's deb dependency file to me? please. I am a good boy.Thank you very much!

Look at https://packages.ubuntu.com/bionic-updates/devel/gcc

The gcc deb file is only 5 KB in size, because this package does not contain much by itself. But this package depends on other packages, which contain the real functionality.
e.g. https://packages.ubuntu.com/bionic-updates/gcc-7 - 7 MB size and https://packages.ubuntu.com/bionic-updates/cpp-7 6 MB

You can install gcc only, if you have installed gcc-7 and cpp-7 and some additional packages.

于 November 18, 2018 12:43:46 PM UTC, Manfred Hampl <email address hidden> 写到:
> Your question #676229 on gcc-defaults in Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+source/gcc-defaults/+question/676229
>
> Status: Open => Answered
>
> Manfred Hampl proposed the following answer:
> Look at https://packages.ubuntu.com/bionic-updates/devel/gcc
>
> The gcc deb file is only 5 KB in size, because this package does not
> contain much by itself. But this package depends on other packages,
> which contain the real functionality.
> e.g. https://packages.ubuntu.com/bionic-updates/gcc-7 - 7 MB size and
> https://packages.ubuntu.com/bionic-updates/cpp-7 6 MB
>
> You can install gcc only, if you have installed gcc-7 and cpp-7 and
> some
> additional packages.

Thank you, I know. I have put all these dependencies down, how to install them?

dpkg -i?

One by one installation is too much trouble. headache

Yes, the right command for installing software from deb packages is
sudo dpkg --install …
or
sudo dpkg -i …

If you have put the deb files into a directory, you can use wildcards
sudo dpkg --install *.deb
or use the --recursive option
sudo dpkg --install --recursive /path/to/directory