problem
Because the use Vivado 2018.2, supporting the use of Ubuntu 16.04, after the installation of Petalinux, reboot loop problem login screen appears. (Root cause may be compatibility issues with FTP related software)
Solution
Ctrl + Alt + F1 or F2 / F3 / F4 / F5 / F6 to enter tty mode, landing root account, run the command,
# Configure a package which has been unpacked but not yet configured. If -a is given instead of package,
# all unpacked but unconfigured packages are configured.
# dpkg --configure -a
Problems encountered in the middle of ... dpkg frontend Locked by Another Process
# rm -f /var/lib/dpkg/lock-frontend # rm -f /var/lib/dpkg/lock # rm -f /var/cache/apt/archives/lock
Finish.