how to 
-downgrade ppa's packages to genuine version
- un-pin 'unity' (The package 'unity' is marked for removal but it is in the 
removal blacklist)
-deactivate ppas
?
i saw one ppa from webupdjava8 that i removed using ppa-purge. still nothing.
same error.
apt-get update fails with 

(appstreamcli:5778): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:5778): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:5778): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:5778): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:5778): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:5778): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

how to fix?

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https://bugs.launchpad.net/bugs/1768561

Title:
  Update to Ubuntu 18.04 LTS fails

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