Stop QGIS from generating the .aux.xml files when opening GeoTiff files

1. Start QGIS
2. Go to "Settings" > "Options"
3. In Options window, find "System", then "Environment"
4. Add environment variable "GDAL_PAM_ENABLED" with value equals "NO"
5. Restart QGIS

Reference: https://blog.csdn.net/u014311125/article/details/108625203

NO_PUBKEY when updating QGIS in Linux / Ubuntu (2022)

Update the key file (qgis-archive.gpg) by:

wget  -qO  -  https://qgis.org/downloads/qgis-2022.gpg.key  |  gpg  --no-default-keyring  --keyring  gnupg-ring:/etc/apt/trusted.gpg.d/qgis-archive.gpg  --import

The NO_PUBKEY error message will be gone for 'apt update'

QGIS freezes while editing features

There are many possibilities for QGIS to hang / freezes while editing features. But for my experience, I found it often hangs when using a Shapefile layer.

To minimize this kind of problem, I tried to use other feature format (e.g. SpatialLite). And the problem is relieved to some extent.

Have a try and let me know if it helps or not.