I try to modify the locale settings using the Regional Settings dialog in system settings. On pressing Apply, 
I get the error that locale-gen cannot be found. However, the program is installed:

sts@nbof16:~$ sudo which locale-gen
[sudo] password for sts: 
/usr/sbin/locale-gen

On debian, the directory /usr/sbin is not in the regular user ${PATH} list, but in root's ${PATH} only and the program may have to be run as root to succeed.
A second attempt to change a setting results in 'Another process is already running, please retry later'  




STEPS TO REPRODUCE
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OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION