Can't install Synaptic Package Manager

[jesselashcraft]

I can't find Synaptic Package Manager in Software. Terminal is telling me "'synaptic' has no installation candidate." I'm using Zorin 16.3 Core - that shouldn't matter, right?

[Mr_Magoo]

You're sure you're spelling it correctly?

sudo apt search synaptic
synaptic/focal,now 0.84.6ubuntu5 amd64 [installed]
Graphical package manager

sudo apt show synaptic

sudo apt show synaptic
Package: synaptic
Version: 0.84.6ubuntu5
Priority: optional
Section: universe/admin
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Michael Vogt <mvo@debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 3,379 kB
Depends: libapt-pkg6.0 (>= 1.9.0), libc6 (>= 2.14), libept1.6.0, libgcc-s1 (>= 3.0), libgdk-pixbuf2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.14.0), libgtk-3-0 (>= 3.11.7), libpango-1.0-0 (>= 1.14.0), libstdc++6 (>= 5.2), libvte-2.91-0, libxapian30 (>= 1.4.14~), hicolor-icon-theme, policykit-1
Recommends: libgtk3-perl, xdg-utils
Suggests: dwww, menu, deborphan, apt-xapian-index, tasksel, software-properties-gtk
Conflicts: menu (<< 2.1.11)
Homepage: http://www.nongnu.org/synaptic/
Download-Size: 622 kB
APT-Manual-Installed: yes
APT-Sources: http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
Description: Graphical package manager
 Synaptic is a graphical package management tool based on GTK+ and APT.
 Synaptic enables you to install, upgrade and remove software packages in
 a user friendly way.
 .
 Besides these basic functions the following features are provided:
  * Search and filter the list of available packages
  * Perform smart system upgrades
  * Fix broken package dependencies
  * Edit the list of used repositories (sources.list)
  * Download the latest changelog of a package
  * Configure packages through the debconf system
  * Browse all available documentation related to a package (dwww is required)

sudo apt install synaptic

The only other thing I can think of is if the list of sources is somehow messed up.
In Software Updater > Settings > Other Software, I've got:

Type: Binary
URI: https://ppa.launchpadcontent.net/zorinos/stable/ubuntu
Distribution: focal
Components: main

Type: Binary
URI: https://packages.zorinos.com/stable
Distribution: focal
Components: main

Type: Binary
URI: https://packages.zorinos.com/patches
Distribution: focal
Components: main

Type: Binary
URI: https://packages.zorinos.com/apps
Distribution: focal
Components: main

Type: Binary
URI: https://packages.zorinos.com/drivers
Distribution: focal
Components: main restricted

Type: Binary
URI: https://ppa.launchpadcontent.net/zorinos/patches/ubuntu
Distribution: focal
Components: main

Type: Binary
URI: http://ppa.launchpad.net/kelebek333/mint-tools/ubuntu
Distribution: focal
Components: main

Type: Binary
URI: https://ppa.launchpadcontent.net/zorinos/drivers/ubuntu
Distribution: focal
Components: main

Type: Binary
URI: https://ppa.launchpadcontent.net/zorinos/apps/ubuntu
Distribution: focal
Components: main

[Ponce-De-Leon]

@jesselashcraft

that shouldn't matter, right?

I had it on 16.3 too. So that is not the Problem. I had it in Gnome Software Center and in APT. How did You searched it?

[jesselashcraft]

My Software Updater>Settings>Other Software doesn't look like yours at all. It's a mystery:

[jesselashcraft]

I hit the "Z" button > Software.

[Mr_Magoo]

Try searching for just 'Synaptic'.

Also, on the Software & Updates > Other Software tab, select each line that has a check-mark, then select  Edit , going through each check-marked entry to ensure yours looks like the entries that I put in my last post.

The entry:

Type: Binary
URI: http://ppa.launchpad.net/kelebek333/mint-tools/ubuntu
Distribution: focal
Components: main

... is related to Warpinator, which I use to transfer files to/from my Android phone. So you can probably ignore that one.

[Ponce-De-Leon]

That is interessting. Could You make a Screenshot from the ''Other Software'' Tab in big? I mean that we can see the whole List.

[Mr_Magoo]

[EDIT]
Ha, ha! Sorry, just woke up and not fully... thought you were the OP asking for the above.

[Ponce-De-Leon]

No Problem. Actually, it is good because @jesselashcraft can so look if the List's have the same Entries.

[Mr_Magoo]

It's got to be the URIs, then. Go through and make sure all of the URIs in your list match mine (except, of course, for the Warpinator entry).

Ensure the 'https' matches... there was an issue a bit ago with using 'http'.

Note especially the verbiage there:

Don't change the rest of each line, just substitute https://ppa.launchpadcontent.net for http://ppa.launchpad.net in each line.

Note the change from http to https.

[Aravisian]

Please open Software & Updates
In the first General tab ensure that the "Community maintained free and open source software" option is checked. Synaptic is kept in the Universe repository.

Run

sudo apt update && sudo apt install synaptic

[jesselashcraft]

I found the four you listed. I had to add "content" to the end of "launchpad" in the URI line but the other three matched. Used "synaptic" only but still no joy. Under Software and Updates, I selected the best server for downloads in my area according to the machine.

I try to refresh available software and get an error message.

[jesselashcraft]

OK, got it installed. Thanks team.

[Mr_Magoo]

Make sure to change from 'http' to 'https' on each of those, as well, otherwise it won't work.

[jesselashcraft]

OK, done.