“Shed” was overdue for software updates and a reboot.
apt-get upgrade outdated said:
The following packages will be upgraded:
firefox firefox-gnome-support google-chrome-stable icedtea-6-jre-cacao
insserv . . . openjdk blah blah qt something blah blah. . .
49 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
Need to get 0B/141MB of archives.
After this operation, 1,147kB disk space will be freed.
Do you want to continue [Y/n]? Y
I don’t know which of the 48 packages I upgraded was responsible for reducing the space used, and this shouldn’t be notable, but I’m noting it.