best Graphical disk space explorer utility for Ubuntu?

Ubuntu default Disk Usage Analyzer (GNOME)

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Personally I like KDirStat.

kdirstat screenshot

TreeSize for Unix

Filelight (KDE)

xdiskusage

While not the prettiest, ncdu works in a text-only terminal and does provide a simple graph of each entry.

Not at all graphical, but highly useful: gt5

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