Copy the selected text or region onto the clipboard. Before getting started, it’s recommended to remove old Emacs (if any) by running command in terminal (Ctrl+Alt+T). Here's a brief animation derived from the video link cited above. Cut the selected text or region and place it on the clipboard. For those hating the Flatpak and Snap packages, here’s how to compile GNU Emacs editor (v27.2 tested) from the source tarball while the Kevin Kelley’s PPA seems NOT to be updated anymore. The selected area will change to cover just the column.
Left-click immediately to the left of the letter at the top left of the intended column and select down to include the lowest letter at the bottom right of the intended column. The mode will be reflected near the top right corner of the window. Then, when the need arises to perform edits involving columns, activate Multi Edit Mode from Tools.
Open gedit > Preferences > Plugins and enable Multi Edit. One of the neatest features of this program is that it supports tabs, so you can edit multiple files. It is the default text editor of the GNOME desktop environment. Run sudo apt install gedit-plugin-multi-edit. gedit is a powerful general purpose text editor in Linux. Even though the links are from 2009, the plugin works in gedit 3.28.1 which is found in Bionic Beaver. I found a blog post which links to a video demonstrating column selection mode. This answer is based on steeldriver's suggestion to look into gedit-plugin-multi-edit.
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