aptitude safe-upgrade recommends gnome-system-monitor mate-system-monitor why ?

[osde8info]

why does aptitude safe-update recommend gnome-system-monitor and mate-system-monitor ?

xfce monitors are fine for me

Code:

# aptitude safe-upgrade
The following packages will be upgraded:
  base-files compiz compiz-core compiz-gnome compiz-plugins-default libcompizconfig0 libdecoration0
  python3-distupgrade ubuntu-release-upgrader-core
The following packages are RECOMMENDED but will NOT be installed:
  gnome-system-monitor mate-system-monitor
9 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,658 kB of archives. After unpacking 0 B will be used.
Do you want to continue? [Y/n/?] n

[osde8info]

and the second time you run it is changes its mind and doesnt mention them

its very confusing ???

Code:

# aptitude safe-upgrade
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.