The shortcut icons get placed in a folder
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\QGIS 3.14
(or whatever version you have).
I believe the root cause of the problem is related to the fact that there isn't really an uninstaller for QGIS. whilst you have manually delete it, Windows still knows about it, and i THINK what happens is during re-...
If these solutions don't work, this was a simple fix: https://support.esri.com/en/technical-article/000022262
Clear all cache files in the AppData folder, and relaunch ArcGIS Pro.
I tried installing Orfeo Toolbox in QGIS on Mac and struggled a lot but eventually managed it. Here's how for any beginners confused by terminology:
https://www.orfeo-toolbox.org/download/ (download MacOS)
Make sure the file does not end in .txt, if it does, remove this so it just ends in .run
Go to terminal and run these commands:
chmod +x OTB-7.2.0-...
So, after a bit of time and several tips I was able to install QGIS 3
Step 1. With executing several commands from the 1st way to install QGIS (preferred.) erase unnecessary QGIS related repositories
First remove already added repositories which you tried to install QGIS:
Execute this in your terminal: sudo software-properties-gtk and go to Other Software ...
I can't comment with my user status yet, so I have to write my suggestions/comment as an answer.
I'm facing the same problems with kde neon.
If you run sudo apt install qgis-providers python3-qgis qgis qgis-plugin-grass to install the depending packages as well you'll get probably the message "qtbase-abi-5-12-8" is missing, even if "...
You have to install it "manually" and unfortunately you have to have also proj>=6 and other dependencies.
Here is the process:
# Check Debian version (I guess you have Buster version)
# OPTIONAL --> QGIS 3.10:
# add this lines to --> sudo nano /etc/apt/sources.list
deb https://qgis.org/debian-lrt ...