nmon binary package in Ubuntu Bionic i386

 nmon is a systems administrator, tuner, benchmark tool.
 It can display the CPU, memory, network, disks (mini graphs or numbers),
 file systems, NFS, top processes, resources (Linux version & processors) and
 on Power micro-partition information.
 .
 Data is displayed on the screen and updated once every two seconds, using a
 dumb screen. However, you can easily change this interval to a longer or
 shorter time period.
 .
 The nmon tool can also capture the same data to a text file for later analysis
 and graphing for reports. The output is in a spreadsheet format (.csv).

Source package