Just noticed this in syslog and found this bug. Seems to be benign on mate for me at any rate.
lsb-release: DISTRIB_ID=Ubuntu DISTRIB_RELEASE=15.10 DISTRIB_CODENAME=wily DISTRIB_DESCRIPTION="Ubuntu 15.10" syslog: mate-screensaver-dialog: pam_ecryptfs: seteuid error ** Also affects: ubuntu-mate Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/1085706 Title: pam_ecryptfs: seteuid error Status in eCryptfs: Confirmed Status in GNOME Screensaver: New Status in ubuntu-mate: New Status in ecryptfs-utils package in Ubuntu: Triaged Status in gnome-screensaver package in Ubuntu: Triaged Status in plasma-workspace package in Ubuntu: Confirmed Status in gnome-screensaver package in Debian: New Bug description: I get this error message in the syslog when I authenticate succesfully in the screensaver. --- ApportVersion: 2.6.1-0ubuntu6 Architecture: amd64 DistroRelease: Ubuntu 12.10 EcryptfsInUse: Yes GnomeSessionIdleInhibited: No GnomeSessionInhibitors: None GsettingsGnomeSession: org.gnome.desktop.session idle-delay uint32 600 org.gnome.desktop.session session-name 'ubuntu' InstallationDate: Installed on 2012-06-13 (172 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) MarkForUpload: True Package: gnome-screensaver 3.6.0-0ubuntu2 PackageArchitecture: amd64 ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7 Tags: quantal running-unity Uname: Linux 3.5.0-19-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo To manage notifications about this bug go to: https://bugs.launchpad.net/ecryptfs/+bug/1085706/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp