Can't install Adobe Flash Plugin in 10.10

I installed the Adobe Flash plugin from the software center. Installation took a long and never finished.

After a reboot the package is marked as installed but Firefox still says its missing this plugin. I tried uninstalling it from the software center but it just says 'removing" for ever.

What can I do?

UPDATE

$ sudo apt-get install flashplugin-installer
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

I guess it's because it's still being "removed" (although the software center window is closed).

UPDATE 2

After a reboot:

$ sudo apt-get install flashplugin-installer
E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

UPDATE 3

$ sudo dpkg --configure -a
Setting up flashplugin-installer (10.1.85.3ubuntu1) ...
Downloading...
--2010-10-17 11:18:31--  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Resolving archive.canonical.com... 91.189.88.33
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2010-10-17 11:21:41--  (try: 2)  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2010-10-17 11:22:04--  (try: 3)  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2010-10-17 11:22:52--  (try: 4)  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response...

And I guess it will keep on...

UPDATE 4

Seems like this is related: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/661979?comments=all

UPDATE 5 I tried removing it first then install again using apt-get:

$ sudo apt-get remove flashplugin-installer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  flashplugin-installer
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 188kB disk space will be freed.
Do you want to continue [Y/n]? 
(Reading database ... 120250 files and directories currently installed.)
Removing flashplugin-installer ...

$ sudo apt-get install flashplugin-installer
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  xulrunner-1.9 firefox-3.0 konqueror-nsplugins msttcorefonts
  ttf-bitstream-vera ttf-dejavu ttf-xfree86-nonfree xfs
The following NEW packages will be installed:
  flashplugin-installer
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/20.0kB of archives.
After this operation, 188kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously deselected package flashplugin-installer.
(Reading database ... 120229 files and directories currently installed.)
Unpacking flashplugin-installer (from .../flashplugin-installer_10.1.85.3ubuntu1_i386.deb) ...
Setting up flashplugin-installer (10.1.85.3ubuntu1) ...
Downloading...
--2010-10-17 11:26:48--  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Resolving archive.canonical.com... 91.189.88.33
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2010-10-17 11:27:34--  (try: 2)  http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_10.1.85.3.orig.tar.gz
Connecting to archive.canonical.com|91.189.88.33|:80... connected.
HTTP request sent, awaiting response...