package cacti 0.8.8b+dfsg-5 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

[Carlos Lopez Sanchez]

Install/uninstall problem .

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: cacti 0.8.8b+dfsg-5
ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic i686
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: i386
Date: Wed Apr 22 01:31:32 2015
DuplicateSignature: package:cacti:0.8.8b+dfsg-5:subprocess installed pre-removal script returned error exit status 1
ErrorMessage: subprocess installed pre-removal script returned error exit status 1
InstallationDate: Installed on 2012-04-23 (1093 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
PackageArchitecture: all
SourcePackage: cacti
Title: package cacti 0.8.8b+dfsg-5 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
UpgradeStatus: Upgraded to trusty on 2014-08-19 (245 days ago)

[Paul Gevers (paul-climbing)]

You did not provide the password for the mysql administrator. This means
that the permissions for the cacti user can't be removed. Unfortunately,
that is a operator error, you must supply the valid password.

Removing cacti (0.8.8b+dfsg-5) ...
Use of uninitialized value $_[1] in join or string at
/usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 26.
dbconfig-common: dumping mysql database cacti to
/var/tmp/cacti.cacti.2015-04-22-01.31.mysql.hWPana.
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
password: NO).
unable to connect to mysql server.
error encountered dumping database:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
password: NO)
dbconfig-common: cacti remove: aborted.
dbconfig-common: flushing administrative password
dpkg: error processing package cacti (--remove):
 subprocess installed pre-removal script returned error exit status 1

[Paul Gevers (paul-climbing)]

Invalid as per previous comment: operator error.