Lnmp1.6安装失败，不知道怎么回事，附上log - VPS侦探论坛

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:
build-essential : Depends: libc6-dev but it is not going to be installed or
                        libc-dev
g++ : Depends: g++-6 (>= 6.3.0-9~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Reading package lists...
Building dependency tree...
Reading state information...
debian-keyring is already the newest version (2017.05.28).
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
debian-archive-keyring is already the newest version (2017.5+deb9u1).
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Reading package lists...
Building dependency tree...
Reading state information...
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:
build-essential : Depends: libc6-dev but it is not going to be installed or
                        libc-dev
               Depends: g++ (>= 4:6.3) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.