This happened to me because I had enabled an alternative authentication
mechanism in PAM (fingerprint reader). As soon as I disabled that, gksu
started working again. The lines in /etc/pam.d/common-auth look(ed)
like this:
auth sufficient pam_bioapi.so {<snip>} /etc/bioapi/pam/
password sufficient pam_bioapi.so {<snip>} /etc/bioapi/pam/
This works fine for GDM; as soon as I enter my username at the initial
login screen, I get a prompt to swipe my finger. gksu never shows
anything, however. It just hangs there indefinitely. strace output is
(over and over):
nanosleep({0, 1000000}, NULL) = 0
read(15, 0xb7fa2000, 1024) = -1 EAGAIN (Resource temporarily
unavailable)
waitpid(13318, 0xbfaca18c, WNOHANG) = 0
stat64("/proc/13318", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
open("/proc/13318/stat", O_RDONLY) = 16
read(16, "13318 (sudo) S 13317 13318 13318"..., 8191) = 189
close(16) = 0
--
gksu doesn't always pop up a dialog
https://bugs.launchpad.net/bugs/91151
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