Welcome to Ask Ubuntu! Does this appear on all file systems or only Windows file systems and external media (i. e. FAT and NTFS)? Could you please [edit] your question to include the output of locale, grep -e '^/dev/' /proc/mounts and LC_MESSAGES=POSIX dpkg -l culmus xfonts-efont-unicode xfonts-efont-unicode-ib xfonts-intl-european ttf-mscorefonts-installer 2>/dev/null? Thanks.
– David FoersterJul 16 '18 at 18:19
locale,grep -e '^/dev/' /proc/mountsandLC_MESSAGES=POSIX dpkg -l culmus xfonts-efont-unicode xfonts-efont-unicode-ib xfonts-intl-european ttf-mscorefonts-installer 2>/dev/null? Thanks. – David Foerster Jul 16 '18 at 18:19