aptaptitude
Why was aptitude removed in favor of apt-get by default? I read it somewhere, but forgot – anyone bother to clear it up? And doesn't Debian prefer aptitude and Canonical apt-get?
Update
From the answers I understand aptitude was removed because it was no longer used for installation, but why does the installer use apt-get, when aptitude is supposed to be better?
Instead of apt-get I would have a look at apt-cache, though not one on one the same but close will be:
apt-cache --installed rdepends firefox
Credit to gunnar-hjalmarsson for this answer.
Adobe once began life making fonts for Microsoft Windows. Later it became the premiere program for playing videos over the internet and live TV broadcasts (which I use it for). However now HTML5 is commonly used for playing videos in Google's YouTube and FlashPlayer is becoming marginalized.
Within Google Chrome web browser PepperFlash support is built in so a separate flash plugin is no longer required for watching flash content. However on my system (perhaps because I deleted Google Chrome Beta) the error in the original question occurred.
The error message:
Err:1 http://archive.canonical.com/pool/partner/a/adobe-flashplugin/adobe-flashplugin_20160913.1.orig.tar.gz
showed up because Canonical partners was not enabled. I don't remember turning it off but the solution is to turn it on.
To enable partners in Canonical select System Settings then Software & Updates and then Other Partners. This screen appears:
Check the box to allow partners.
As Gunnar points out flashplugin-installer isn't needed for firefox so adobe-flashplugin is a better option to install. Google chrome has flash player support embedded through a process called Pepper Flash Player and doesn't need flashplugin-installer either.
The final solution is:
sudo apt-get remove flashplugin-installer
sudo apt-get purge flashplugin-installer
sudo apt-get install adobe-flashplugin
Thanks again to Gunnar for his comments to solve the pesky pop-up message.
Although flashplugin-installer is in the title and body, the partner errors could apply to many situations and I welcome recommendations to change the title, question or answer.
PS I realize remove and purge can be combined into a single line. I also realize apt-get is inferior to a solo apt in many respects.
PPS Adobe also gets credit for .PDF files although on Linux platform many free alternatives exist.
PPPS I notice there are other boxes not checked off on the screenshot above and if this answer can be improved by explaining them don't hesitate to comment. I am dpkg challenged as recent down votes have proved.
Best Answer
This has been covered in Bug #592336 on LaunchPad. However, in summary it was decided during the UDS-M (Ubuntu Developer Summit) that 2 additional MB could be gained on the limited LiveCD image if Tasksel and Aptitude were removed.
Since the installer no longer requires aptitude, having it installed dynamically when needed, rather than including it in the base image, won as the better course of action.
Both the spec and Ubuntu Wiki page for the Maverick Spring Cleaning state that removing this from base has a great benefit for the inital seed and base size.