[Bug 1698915] Re: package php7.0-xml 7.0.18-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

[Nish Aravamudan]

*** This bug is a duplicate of bug 1646739 ***
    https://bugs.launchpad.net/bugs/1646739

Hello and thank you for reporting this issue.

Unfortunately this is a well-known (although not yet solved) issue with
update-manager and some packages. I am marking it as a duplicate, but in
the meanwhile, you can simply do:

sudo apt update
sudo apt -f install

In a terminal and it should resolve the package installation failure.

** This bug has been marked a duplicate of bug 1646739
   "Use of uninitialized value" in debconf via update-manager

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https://bugs.launchpad.net/bugs/1698915

Title:
  package php7.0-xml 7.0.18-0ubuntu0.16.04.1 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 128

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