The way I understand what is happening (maybe I'm wrong), dpkg fails to
replace update-manager. The relevant terminal output:
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 1674, in <module>
main()
File "/usr/bin/pycentral", line 1668, in main
rv = action.run(global_options)
File "/usr/bin/pycentral", line 1169, 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
I don't see any errors stating that it can't install because update-
manager is already installed. It is attempting to "replace" update-
manager when it fails.
--
package update-manager 1:0.81 failed to install/upgrade: subprocess
pre-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/196356
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