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Screenshots are powerful tool especially when documenting some bugs et al, I found flameshot to be most versatile with many features which anyone would appreciate.
flameshot — Powerful yet simple-to-use screenshot software
How to install flameshot in ubuntu?
$ sudo apt-get install flameshot
Reading package lists... Done
Building dependency tree
Reading state information... Done
...
Rebuilding /usr/share/applications/bamf-2.index...
How to execute in Ubuntu 19.10?
$ flameshot gui