尝试使用以下命令安装 gcc：
raihan@raihan-home:~$ sudo apt install build-essential
Reading package lists... Done
Building dependency tree
Reading state information... Done
build-essential is already the newest version (12.4ubuntu1).
The following packages were automatically installed and are no longer required:
libmysqlclient20 python-cryptodome python-olefile python-pil python-simplejson
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
和
raihan@raihan-home:~$ sudo apt-get install gcc
Reading package lists... Done
Building dependency tree
Reading state information... Done
gcc is already the newest version (4:7.4.0-1ubuntu2.3).
The following packages were automatically installed and are no longer required:
libmysqlclient20 python-cryptodome python-olefile python-pil python-simplejson
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 9 not upgraded.
但是当我运行 gcc --version 它说没有安装
raihan@raihan-home:~$ gcc --version
Command 'gcc' not found, but can be installed with:
sudo apt install gcc
它还显示我已经安装了 gcc
raihan@raihan-home:~$ ls -l /usr/bin/gcc*
lrwxrwxrwx 1 root root 16 May 17 12:45 /usr/bin/gcc -> /usr/bin/gcc-4.7
-rwxr-xr-x 1 root root 907648 Apr 12 2018 /usr/bin/gcc-5
lrwxrwxrwx 1 root root 22 Dec 4 20:25 /usr/bin/gcc-7 -> x86_64-linux-gnu-gcc-7
lrwxrwxrwx 1 root root 8 May 20 2019 /usr/bin/gcc-ar -> gcc-ar-7
-rwxr-xr-x 1 root root 31264 Apr 12 2018 /usr/bin/gcc-ar-5
lrwxrwxrwx 1 root root 25 Dec 4 20:25 /usr/bin/gcc-ar-7 -> x86_64-linux-gnu-gcc-ar-7
lrwxrwxrwx 1 root root 8 May 20 2019 /usr/bin/gcc-nm -> gcc-nm-7
-rwxr-xr-x 1 root root 31264 Apr 12 2018 /usr/bin/gcc-nm-5
lrwxrwxrwx 1 root root 25 Dec 4 20:25 /usr/bin/gcc-nm-7 -> x86_64-linux-gnu-gcc-nm-7
lrwxrwxrwx 1 root root 12 May 20 2019 /usr/bin/gcc-ranlib -> gcc-ranlib-7
-rwxr-xr-x 1 root root 31264 Apr 12 2018 /usr/bin/gcc-ranlib-5
lrwxrwxrwx 1 root root 29 Dec 4 20:25 /usr/bin/gcc-ranlib-7 -> x86_64-linux-gnu-gcc-ranlib-7
请帮我解决一下情况