I get the following on AppManager:

Disk Utilization

Disk      Used (%)   ↑    Used (MB)        Free (%)        Free (MB)       Threshold  /repositories 85   101,039   15   18,084

However, when I check on the actual system I get the following:

Can you please advise why there is a 5% difference between AppManager and the Linux systems? 

Please let me know if you require any further information. 

Thanks 

Antje