SUMMARY I cannot open PDFs from a password protected samba share STEPS TO REPRODUCE Using nemo on cinnamon desktop, try to open a pdf with okular. OBSERVED RESULT I got this error: Could not open smb://<hostname.local/file>.pdf Unable to create io-slave. Klauncher said:unknown protocol 'smb'. EXPECTED RESULT The issue isn't nemo because it works with document viewer on the same samba share and file. SOFTWARE/OS VERSIONS Debian Bullseye, Cinammon desktop, nemo 4.6.8, okular 20.12.3 ADDITIONAL INFORMATION