Adobe Lightroom will not allow you to save catalogs to network drives by design. The following commands allow you to circumvent this limitation on Windows:

C:\> mklink /D H_mapping \\your_server\hugo
symbolic link created for H_mapping <<===>> \\your_server\hugo

C:\>mklink /J H_mapping_junction  H_mapping
Junction created for H_mapping_junction <<===>> H_mapping

Then you can save your Lightroom catalog in C:\H_mapping_junction. You need to run these commands with Administrator rights.