Sudo causing segmentation fault

[man-jar-oh]

Could you please explain how these two specific packages alone can be downgraded ? Thanks.

[Yochanan]

To be frank, if you don’t know how to downgrade packages, you probably shouldn’t be using the unstable branch.

$ su
# downgrade fprintd libfprint

Choose the versions I mentioned above and answer y to add them to IgnorePkg.

If you don’t have a fingerprint sensor, you could probably just remove them instead.

[Torom]

fprintd released 7 h ago 1.90.7 with the following release notes:

Version 1.90.7:

While 1.90.6 fixed a number of issues, we did have a bad regression due
causing pam_fprintd to crash when there are no fingerprint devices
installed.

Highlights:
 - pam: Guard strdup calls against NULL pointers

Edit: Removing them solved the problem immediately.

[man-jar-oh]

@Yochanan

if you don’t know how to downgrade packages, you probably shouldn’t be using the unstable branch.

I won’t know/learn until I do it the first time right. Now I know how. For me, that’s the point behind tinkering with Linux. Someday I’ll know enough to be able to teach others

Thanks for explaining and teaching me something new.

[alfrede]

Okay the update worked for me, too.

But when you don’t have installed downgrade you can boot from an usb stick and mount your filesystem.
Edit the file: /etc/pam.d/sudo and comment out the pam.fprint.d

#auth sufficient pam_fprintd.so.

Further i added in /etc/pam.d/su**

auth sufficient pam_wheel.so trust use_uid
auth required pam_wheel.so use_uid

After that reboot and you have sudo without a problem and you can update fprintd.