I followed the instruction from http://fedoraproject.org/wiki/DNF_system_upgrade to upgrade a system from F26 to F27. Everything seemed to work correctly (all packages installed and checked), then the system rebooted on F27. I saw the fedora icon now surrounded by a white square. But it is now stalled with only this on the screen: [ 6.196960] tpm tpm0: tpm_try_transmit: tpm_send: error -62. Apparently, I can access the system with ssh. Looking at the journal, I see a lot of red (many more such lines in the log): May 15 14:14:50 beta sddm-helper[4245]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so May 15 14:14:50 beta audit[4245]: USER_ACCT pid=4245 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct="sddm" exe="/usr/libe May 15 14:14:50 beta audit[4245]: USER_AUTH pid=4245 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/ May 15 14:14:50 beta sddm-helper[4245]: PAM unable to dlopen(/usr/lib64/security/pam_elogind.so): /usr/lib64/security/pam_elogind.so: cannot open shared object file: No such file or directory May 15 14:14:50 beta sddm[1233]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running. May 15 14:14:49 beta sddm-helper[4240]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so May 15 14:14:49 beta audit[4240]: USER_ACCT pid=4240 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct="sddm" exe="/usr/libe May 15 14:14:49 beta audit[4240]: USER_AUTH pid=4240 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/ May 15 14:14:49 beta sddm-helper[4240]: PAM unable to dlopen(/usr/lib64/security/pam_elogind.so): /usr/lib64/security/pam_elogind.so: cannot open shared object file: No such file or directory May 15 14:14:49 beta sddm[1233]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running. May 15 14:14:49 beta sddm-helper[4235]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so May 15 14:14:49 beta audit[4235]: USER_ACCT pid=4235 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct="sddm" exe="/usr/libe May 15 14:14:49 beta audit[4235]: USER_AUTH pid=4235 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/ May 15 14:14:49 beta sddm-helper[4235]: PAM unable to dlopen(/usr/lib64/security/pam_elogind.so): /usr/lib64/security/pam_elogind.so: cannot open shared object file: No such file or directory May 15 14:14:49 beta sddm[1233]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running. May 15 14:14:49 beta sddm-helper[4230]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so May 15 14:14:49 beta audit[4230]: USER_ACCT pid=4230 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct="sddm" exe="/usr/libe May 15 14:14:49 beta audit[4230]: USER_AUTH pid=4230 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/ May 15 14:14:49 beta sddm-helper[4230]: PAM unable to dlopen(/usr/lib64/security/pam_elogind.so): /usr/lib64/security/pam_elogind.so: cannot open shared object file: No such file or directory May 15 14:14:49 beta sddm[1233]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running. May 15 14:14:49 beta sddm-helper[4225]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so May 15 14:14:49 beta audit[4225]: USER_ACCT pid=4225 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:accounting grantors=pam_permit acct="sddm" exe="/usr/libe May 15 14:14:49 beta audit[4225]: USER_AUTH pid=4225 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 msg='op=PAM:authentication grantors=pam_permit acct="sddm" exe="/usr/ May 15 14:14:49 beta sddm-helper[4225]: PAM unable to dlopen(/usr/lib64/security/pam_elogind.so): /usr/lib64/security/pam_elogind.so: cannot open shared object file: No such file or directory May 15 14:14:49 beta sddm[1233]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running. May 15 14:14:49 beta sddm-helper[4220]: PAM adding faulty module: /usr/lib64/security/pam_elogind.so

> See https://bugzilla.redhat.com/show_bug.cgi?id=1515100. > > I didn't have a problem when I upgraded a while back. I don't have F27 system that > had been updated from F26. But FWIW the current /etc/pam.d/sddm-greeter file contains. > > # Setup session > session required pam_unix.so > -session optional pam_systemd.so > -session optional pam_elogind.so so the difference with mine is just those dash at the start of the last 2 lines. Is this the same as commenting the lines?