Если нет /home/user/.local/share/plasma/plasmoids user - ваш пользователь

drwxrwxr-x  3 user user 4,0K мар  3 01:49 .
drwxr-xr-x 52 user user 4,0K мар  3 01:49 ..
drwxrwxr-x  4 user user 4,0K мар  3 01:49 plasmoids

drwxrwxr-x 4 user user 4,0K мар  3 01:49 .
drwxrwxr-x 3 user user 4,0K мар  3 01:49 ..
drwxrwxr-x 3 user user 4,0K мар  3 01:49 org.kde.batteryBar
drwxrwxr-x 3 user user 4,0K мар  3 01:49 org.kde.NetBandwidthMonitor

sudo apt install plasma-sdk

Links: https://pikabu.ru/story/razrabotka_vidzhetov_plasma__chast_1_7747243