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I recently upgraded from Lubuntu 18.04 to 18.10 then to 19.04 using the inbuilt software updater. But I think with the upgrade some of the apps from 18.04 were retained. For example, there are two terminals in the image below:

This is the image

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    Yes currently you'll have LXDE and LXQt desktops (at the greeter or login screen you can select which you want to use). The Lubuntu team recommended a re-install when you upgraded from 18.04 LTS to 18.10 (first LXQt) for a number of reasons, of which this was one. I would check out this feature before you remove them (just to see if you'd use it; I decided to keep LXDE on my box) lubuntu.me/cosmic-released – guiverc Jun 29 at 12:15
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The switch from LXDE (18.04) to LXQt (18.10) was a huge one, and the Lubuntu team recommended a clean install rather than upgrade for a number of reasons

The most major and notable problem is that upgrading Lubuntu from 18.04 to 18.10 causes a fair amount of issues. Therefore, we are not officially supporting this upgrade path at this time, however we have prepared a page in the Lubuntu Manual which can help address the problems that arise after the upgrade.

https://lubuntu.me/cosmic-released/

The Lubuntu team however wrote notes, for their official manual (https://manual.lubuntu.me/D/upgrading.html)

Please note: The manual now reflects 19.04 which is the latest, but the detail you specifically asked about had this written

After the installation, reboot into the new 18.10 system. You be greeted by a new login screen that is the SDDM display manager and a notification that this is now your first time running LXQt Power Management.

Many of the old applications will not be removed. Newer and often times more featureful, Qt-based applications with the same functionality are installed during the upgrade. Having many unnecessary applications could bloat your system and isn't the true Lubuntu experience, so uninstalling them may be a good idea. The following command will remove unnecessary applications:

.. code::

sudo apt purge leafpad file-roller galculator gpicview xpad xfburn simple-scan mtpaint pidgin sylpheed transmission-gtk abiword evince gnumeric audacious gnome-mpv guvcview pcmanfm gdebi lxterminal hardinfo lightdm lxpanel lxsession obconf gnome-software gnome-disk-utility system-config-printer-gnome lxhotkey-gtk synaptic update-manager lxpolkit lxtask lxshortcut blueman usb-creator-gtk evince-common

To remove uneeded dependencies enter the following command:

.. code::

sudo apt autoremove

I'm copying this from the Lubuntu team's phab infrastructure, sorry I don't know how to navigate it as a normal user. I know the manual will show release specific pages in the future, but I don't know if it's already been implemented and or to operate it sorry. It could be this wasn't published officially because of the decision to not-support 18.04 to 18.10 upgrades

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