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Friday, October 28, 2022

Ubuntu 22.04 and pcscd auto start failure


Since Ubuntu 22.04 LTS there is a problem with PC/SC daemon automatic start. pcscd is supposed to start when an application makes the first PC/SC call. See "pcscd auto start using systemd". In some cases pcscd will not start and SCardEstablishContext() will receive the error SCARD_E_NO_SERVICE.

A ticket is opened at Ubuntu with bug #1971984: pcscd 1.9.5-3 do not start automatically, only manual

The problem is present on some configurations only. I have no idea why on some systems it works fine and on some others we have the problem.

For an unknown reason pcscd.socket is inactive.

$ systemctl status pcscd.socket
○ pcscd.socket - PC/SC Smart Card Daemon Activation Socket
     Loaded: loaded (/lib/systemd/system/pcscd.socket; disabled; vendor preset: enabled)
     Active: inactive (dead)
   Triggers: ● pcscd.service
     Listen: /run/pcscd/pcscd.comm (Stream)


The fix is easy:

sudo systemctl enable pcscd.socket

And reboot.


No problem on Debian

The same pcscd package has no problem on Debian.

I compared the configuration scripts between the Ubutun and Debian packages and they are the same. I guess the problem comes from systemd or dpkg on Ubuntu and the systemd configuration files are not always installed correctly. Again, no idea why.


The bug is opened since 2022-05-06. I don't know if someone at Ubuntu is working on it.

The pcscd package is in the section Universe (Community-Maintained, Open-Source Software) at Ubuntu. It is not in the section Main (Officially Supported, Open-Source Software) so maybe no engineer from Ubuntu is looking at this issue.

The problem may not be fixed until Ubuntu 24.04, the next LTS version.