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Even if your situation is not precisely listed here, there may be one similar enough to offer hints to the solution of your problem. There are several places to look when you encounter problems with your system, most of which are standard to Linux systems in general, and some are relevant to and select the problem category.
When all information is gathered, attach it to your support request.
If you have a problem with network connectivity, narrow it down as described in Procedure 17.1, “How to Identify Network Problems”.
If Network Manager seems to be the culprit, proceed as follows to get logs providing hints on why Network Manager fails: Data problems are when the machine may or may not boot properly but, in either case, it is clear that there is data corruption on the system and that the system needs to be recovered.
This can be done in the GRUB 2 boot loader screen during the boot process as follows: If the machine starts, but does not boot into the graphical login manager, anticipate problems either with the choice of the default systemd target or the configuration of the X Window System.
When you have identified the cause of your network trouble, you can resolve it yourself (if the problem is located on your machine) or let the system administrators of your network know about your findings so they can reconfigure the services or repair the necessary systems.
In this case, it is necessary to repair the boot loader.
To do so, you need to start the Rescue System as described in Section 17.5.2, “Using the Rescue System” and follow the instructions in Section 18.104.22.168, “Modifying and Re-installing the Boot Loader”.
Many problems of your system may be network-related, even though they do not seem to be at first.
For example, the reason for a system not allowing users to log in may be a network problem of some kind.