Stack Overflow for Teams is a private, secure spot for you and The Log File Viewer displays a number of logs by default, including your system log (syslog), package manager log (dpkg.log), authentication log (auth.log), and graphical server log (Xorg.0.log). The logs can tell you almost anything you need to know, as long as you have an idea where to look first. Are there any diacritics not on the top or bottom of a letter? head filename.txt That will prints the 1st 10 lines of the above text file. Due to the nature of log files being appended to at the bottom, the tail command will generally be more useful. TIP: Using the cat /var/log/dpkg.log | grep “\ install\ “ command is probably the best way of viewing a list of installed packages, because only “install” entries in the log file are displayed. Default Log File Location. 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