*** 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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