Booted up a Ubuntu 14.04 LTS box & followed test procedure. Same result - steps followed fine until I once 256 char password was entered, I was unable to `sudo whoami` (password was not accepted)
OS: Ubuntu 14.04.6 LTS x86_64 Host: HP Compaq dc7700 Small Form Factor Kernel: 3.13.0-168-generic Uptime: 22 mins Packages: 2377 (dpkg) Shell: bash 4.3.11 Theme: Ambiant-MATE [GTK3] Icons: Ambiant-MATE [GTK3] Terminal: gnome-terminal CPU: Intel Core 2 6320 (2) @ 1.867GHz GPU: NVIDIA Quadro NVS 290 Memory: 1071MiB / 4896MiB test@dc7700ub:~$ apt-cache policy libpam0g libpam0g: Installed: 1.1.8-1ubuntu2.2 Candidate: 1.1.8-1ubuntu2.2 Version table: *** 1.1.8-1ubuntu2.2 0 500 http://ftp.iinet.net.au/pub/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 100 /var/lib/dpkg/status 1.1.8-1ubuntu2 0 500 http://ftp.iinet.net.au/pub/ubuntu/ trusty/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1822736 Title: Passwords longer than 255 characters break authentication To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1822736/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs