sudo apt-get install ppa-purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
ppa-purge is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
4 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
dpkg: error processing libxml2:amd64 (--configure):
 package libxml2:amd64 2.7.8.dfsg-5.1ubuntu4.5 cannot be configured because libxml2:i386 is at a different version (2.7.8.dfsg-5.1ubuntu4.4)
dpkg: dependency problems prevent configuration of libcroco3:amd64:
 libcroco3:amd64 depends on libxml2 (>= 2.7.4); however:
  Package libxml2:amd64 is not configured yet.

dpkg: error processing libcroco3:amd64 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of libxml2-utils:
 libxml2-utils depends on libxml2 (>= 2.7.4); however:
  Package libxml2:amd64 is not configured yet.

dpkg: error processing libxml2-utils (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          dpkg: dependency problems prevent configuration of python-libxml2:
 python-libxml2 depends on libxml2 (>= 2.7.4); however:
  Package libxml2:amd64 is not configured yet.

dpkg: error processing python-libxml2 (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
 libxml2:amd64
 libcroco3:amd64
 libxml2-utils
 python-libxml2
E: Sub-process /usr/bin/dpkg returned an error code (1)