Thank you for taking the time to report this bug and helping to make
Ubuntu better.

I note you are using an EOL Ubuntu 17.04 kernel, rather than the
standard Ubuntu 16.04 (4.4) or Ubuntu 16.04 HWE (4.15) kernel, and loads
of tainted messages in your `dmesg`

[28275.945575] WARNING: CPU: 2 PID: 514 at 
/build/linux-hwe-vH8Hlo/linux-hwe-4.10.0/net/wireless/sme.c:891 
cfg80211_roamed+0x8a/0xa0 [cfg80211]
..
[28275.945632] CPU: 2 PID: 514 Comm: wl_event_handle Tainted: P        W  OE   
4.10.0-28-generic #32~16.04.2-Ubuntu

These I suspect are the reason for your problem, ie.

Failed to execute operation: Connection timed out
dpkg: error processing archive 
/var/cache/apt/archives/policykit-1_0.105-14.1ubuntu0.5_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1

thus I would suggest using a supported Ubuntu 16.04 LTS kernel, either
the standard 4.4 or HWE (hardware-enablement-stack) 4.15 and trying
again.  I've marked this bug incomplete, if you believe I'm wrong or
missing something, please return it to new and leave a comment
explaining why.

Thanks again for reporting this issue, and helping making Ubuntu a
better system.

** Changed in: policykit-1 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1838485

Title:
  package policykit-1 0.105-14.1ubuntu0.5 failed to install/upgrade:
  subprocess new pre-installation script returned error exit status 1

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