[Bug 1186442] [NEW] ubuntu says / out of space but isn't

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when I do a df, I get:/$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2        20G   19G  4.6M 100% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            1.8G   12K  1.8G   1% /dev
tmpfs           356M  904K  355M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            1.8G   80K  1.8G   1% /run/shm
none            100M   12K  100M   1% /run/user
/dev/sda1        80G   12G   65G  16% /home

but according to


/$ sudo du -hc --max-depth=1
12G     ./home
15M     ./etc
8.0K    ./media
1.4G    ./var
9.1M    ./bin
153M    ./boot
12K     ./dev
666M    ./lib
4.0K    ./lib64
0       ./mnt
0       ./opt
du: cannot access ‘./proc/23086/task/23086/fd/4’: No such file or directory
du: cannot access ‘./proc/23086/task/23086/fdinfo/4’: No such file or directory
du: cannot access ‘./proc/23086/fd/4’: No such file or directory
du: cannot access ‘./proc/23086/fdinfo/4’: No such file or directory
0       ./proc
352K    ./root
1000K   ./run
13M     ./sbin
0       ./selinux
0       ./srv
0       ./sys
4.0K    ./tmp
4.0G    ./usr
0       ./cdrom
4.0K    ./.config
18G     .
18G     total


says that nothing in / could be taking that much space, so a bug

** Affects: coreutils (Ubuntu)
     Importance: Low
         Status: Invalid


** Tags: bot-comment
-- 
ubuntu says / out of space but isn't
https://bugs.launchpad.net/bugs/1186442
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