在ubuntu 18.04上，安装 gcc-8 g++-8

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问题：

我尝试安装gcc-8和g++-8.错误如下


$ sudo apt-get install gcc-8 g++-8 -y



Some packages could not be installed. This may mean that you have


requested an impossible situation or if you are using the unstable


distribution that some required packages have not yet been created


or been moved out of Incoming.


The following information may help to resolve the situation:



The following packages have unmet dependencies:


 g++-8 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is to be installed


 Depends: libstdc++-8-dev (= 8-20180414-1ubuntu2) but it is not going to be installed


 gcc-8 : Depends: cpp-8 (= 8-20180414-1ubuntu2) but it is not going to be installed


 Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is to be installed


 Depends: libgcc-8-dev (= 8-20180414-1ubuntu2) but it is not going to be installed


 Recommends: libc6-dev (>= 2.13-0ubuntu6) but it is not going to be installed


E: Unable to correct problems, you have held broken packages.

我尝试了下面的方法，但是给出了相同的错误


sudo add-apt-repository ppa:ubuntu-toolchain-r/test


sudo apt-get update


sudo apt-get install gcc-8 g++-8


gcc-8 --version

Aptitude也无法安装-


sudo aptitude install gcc-8


The following NEW packages will be installed:


 cpp-8{ab} gcc-8{b} libasan5{ab} libatomic1{ab} libc-dev-bin{a} 


 libc6-dev{ab} libgcc-8-dev{ab} libitm1{ab} liblsan0{ab} libmpx2{ab} 


 libquadmath0{ab} libtsan0{ab} libubsan1{ab} linux-libc-dev{a} 


 manpages-dev{a} 


0 packages upgraded, 15 newly installed, 0 to remove and 0 not upgraded.


Need to get 24.4 MB of archives. After unpacking 99.9 MB will be used.


The following packages have unmet dependencies:


 libmpx2 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libc6-dev : Depends: libc6 (= 2.27-3ubuntu1) but 2.27-3ubuntu1.2 is installed


 cpp-8 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libitm1 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libasan5 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libquadmath0 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libgcc-8-dev : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libtsan0 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libubsan1 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 gcc-8 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 liblsan0 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


 libatomic1 : Depends: gcc-8-base (= 8-20180414-1ubuntu2) but 8.4.0-1ubuntu1~18.04 is installed


The following actions will resolve these dependencies:



 Keep the following packages at their current version:


1) cpp-8 [Not Installed] 


2) gcc-8 [Not Installed] 


3) libasan5 [Not Installed] 


4) libatomic1 [Not Installed] 


5) libc6-dev [Not Installed] 


6) libgcc-8-dev [Not Installed] 


7) libitm1 [Not Installed] 


8) liblsan0 [Not Installed] 


9) libmpx2 [Not Installed] 


10) libquadmath0 [Not Installed] 


11) libtsan0 [Not Installed] 


12) libubsan1 [Not Installed] 



Accept this solution? [Y/n/q/?] y


No packages will be installed, upgraded, or removed.


0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


Need to get 0 B of archives. After unpacking 0 B will be used.

答案1：

试试sudo aptitude install gcc-8


答案2：

安装gcc，


$ gcc --version


gcc (Ubuntu 8.4.0-1ubuntu1~18.04) 8.4.0


Copyright (C) 2018 Free Software Foundation, Inc.


This is free software; see the source for copying conditions. There is NO


warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Ubuntu  installing  GCC