Comment 2 for bug 196829

Me too

Preparing to replace update-manager 1:0.81 (using .../update-manager_1%3a0.87.9_all.deb) ...
Traceback (most recent call last):
  File "/usr/bin/pycentral", line 1685, in <module>
    main()
  File "/usr/bin/pycentral", line 1679, in main
    rv = action.run(global_options)
  File "/usr/bin/pycentral", line 1180, in run
    pkg.prepare(used_runtimes, old_used_runtimes, old_pkg)
  File "/usr/bin/pycentral", line 803, in prepare
    rt.remove_byte_code(removed_fs)
AttributeError: 'NoneType' object has no attribute 'remove_byte_code'
dpkg: error processing /var/cache/apt/archives/update-manager_1%3a0.87.9_all.deb (--unpack):
 subprocess pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/update-manager_1%3a0.87.9_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)