kubuntu - Tofu character on Workbench

everything else ok, can not display right text on popup , menu.

this type of problems happen when have invalid permissions on font files. solution lies in detecting font file , correcting permission.

since, of font files reside in /usr/share/fonts, can apply generic fix on them.

first make root owner of files , dirs in /usr/share/fonts/

sudo chown -r root:root /usr/share/fonts -v

then change folders visitable fixing permissions on them

find /usr/share/fonts -type d -exec sudo chmod -v 755 {} +

then use command fix permissions on font files.

find /usr/share/fonts -iname '*.[ot]tf' -type f -exec sudo chmod -v 644 {} +

this command lists files .ttf , .otf extension , change permissions of them 644, required permission bits fonts.

you can use command change files permissions 644.

sudo chmod -r a+rx /usr/share/fonts

Primitatvve