linux 使用apt 安装gcc之后（sudo apt install gcc-12），gcc --version显示的还是旧版本

问题一、安装nvidia-driver-535时遇到

Building initial module for 6.5.0-15-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/nvidia-dkms-535.0.crash'
Error! Bad return status for module build on kernel: 6.5.0-15-generic (x86_64)
Consult /var/lib/dkms/nvidia/535.154.05/build/make.log for more information.
dpkg: error processing package nvidia-dkms-535 (--configure):
 installed nvidia-dkms-535 package post-installation script subprocess returned error exit status 10
dpkg: dependency problems prevent configuration of nvidia-driver-535:
 nvidia-driver-535 depends on nvidia-dkms-535 (= 535.154.05-0ubuntu1); however:
  Package nvidia-dkms-535 is not configured yet.

dpkg: error processing package nvidia-driver-535 (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Processing triggers for bamfdaemon (0.5.6+22.04.20220217-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...

查看/var/crash/nvidia-dkms-535.0.crash文件，发现是gcc版本过旧，需要升级到gcc-12

问题二、linux 使用apt 安装gcc之后（sudo apt install gcc-12），gcc --version显示的还是旧版本

解决方法：
首先，gcc-12 --version, 如果可以显示出来是gcc8的版本证明安装成功了
第二步，删除之前的链接，sudo rm /usr/bin/gcc
第三步，重新将新安装的gcc12链接上，sudo ln -s /usr/bin/gcc-12 /usr/bin/gcc
第四步，gcc --version显示的就是gcc12了。