Do note that after the "Grand Update" there are some problems doing a network install.
Example:
Mageia-6-netinstall-x86_64.iso 7/6/17
md5sum: 7b3a11f29a8225ac119221bdbf3bccfb
and using mirrors.kernel.org
there will be a large number of conflicts reported and the install will abort.
Using Live media such as:
Mageia-6-LiveDVD-Plasma-x86_64-DVD.iso 7/11/17
md5sum: 1a152fb3aa5402761688d8aab67ae8df
or the CI:
Mageia-6-x86_64-DVD.iso 7/15/17
md5sum: 55e20da532496124e6e720896fdf9fe4
then updating the install will work just fine.
There are two bugs assigned to this situation. They are:
Summary: netinstall fails after Grand Update
https://bugs.mageia.org/show_bug.cgi?id=23037
Summary: 749 update packages installation failed (conflicts...
https://bugs.mageia.org/show_bug.cgi?id=23016
The bugs are being worked "as we speak".