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My root filesystem is full. how can I fix the problem? I allocated 15G to root which I understand should be sufficient, I wonder if I have configured the partitions correctly. there might be a problem with the /snap directory.

Here is the output of selected commands:

df -h /

$ df -h /
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p2   15G   13G  498M  97% /

df -h

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             16G     0   16G   0% /dev
tmpfs           3.2G  2.1M  3.2G   1% /run
/dev/nvme0n1p2   15G   13G  498M  97% /
tmpfs            16G  4.0M   16G   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs            16G     0   16G   0% /sys/fs/cgroup
/dev/loop0       88M   88M     0 100% /snap/core/5662
/dev/loop1      173M  173M     0 100% /snap/spotify/21
/dev/loop2       15M   15M     0 100% /snap/gnome-logs/45
/dev/loop5      141M  141M     0 100% /snap/gnome-3-26-1604/74
/dev/loop7       13M   13M     0 100% /snap/gnome-characters/124
/dev/loop3       89M   89M     0 100% /snap/core/5897
/dev/loop4      141M  141M     0 100% /snap/gnome-3-26-1604/70
/dev/loop6       13M   13M     0 100% /snap/gnome-characters/139
/dev/loop8      174M  174M     0 100% /snap/spotify/24
/dev/loop10     130M  130M     0 100% /snap/postman/73
/dev/loop9      484M  484M     0 100% /snap/libreoffice/90
/dev/loop11      18M   18M     0 100% /snap/pdftk/9
/dev/loop12      15M   15M     0 100% /snap/gnome-logs/40
/dev/loop13     3.8M  3.8M     0 100% /snap/gnome-system-monitor/57
/dev/loop15     2.3M  2.3M     0 100% /snap/gnome-calculator/222
/dev/loop14      88M   88M     0 100% /snap/core/5742
/dev/loop16      13M   13M     0 100% /snap/gnome-characters/117
/dev/loop17     174M  174M     0 100% /snap/spotify/26
/dev/loop18     3.8M  3.8M     0 100% /snap/gnome-system-monitor/51
/dev/loop20     479M  479M     0 100% /snap/libreoffice/86
/dev/loop19      35M   35M     0 100% /snap/gtk-common-themes/808
/dev/loop21     2.3M  2.3M     0 100% /snap/gnome-calculator/260
/dev/loop22      43M   43M     0 100% /snap/gtk-common-themes/701
/dev/loop23     3.8M  3.8M     0 100% /snap/gnome-system-monitor/54
/dev/loop24      35M   35M     0 100% /snap/gtk-common-themes/818
/dev/loop26     2.3M  2.3M     0 100% /snap/gnome-calculator/238
/dev/loop25     479M  479M     0 100% /snap/libreoffice/85
/dev/loop27      15M   15M     0 100% /snap/gnome-logs/43
/dev/sda1       1.8T  434G  1.3T  25% /home
/dev/nvme0n1p4  215G   61M  204G   1% /m2
/dev/nvme0n1p1  975M  6.1M  968M   1% /boot/efi
tmpfs           3.2G   16K  3.2G   1% /run/user/121
tmpfs           3.2G   36K  3.2G   1% /run/user/1000

sudo du -h --max-depth=1 / | grep '[0-9]G\>'

$ sudo du -h --max-depth=1 / | grep '[0-9]G\>'
434G    /home
11G /snap
4.2G    /usr
2.0G    /tmp
5.6G    /var
du: cannot access '/proc/7893/task/7893/fd/4': No such file or directory
du: cannot access '/proc/7893/task/7893/fdinfo/4': No such file or directory
du: cannot access '/proc/7893/fd/3': No such file or directory
du: cannot access '/proc/7893/fdinfo/3': No such file or directory
du: cannot access '/run/user/1000/gvfs': Permission denied
459G    /

dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n (an alternative could be wajig sizes | tail -30)

$ dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n
[snip]
132042  libreoffice-core
134299  libgl1-mesa-dri
147486  libgl1-mesa-dri
161309  thunderbird
166969  linux-modules-extra-4.15.0-29-generic
166997  linux-modules-extra-4.15.0-34-generic
167001  linux-modules-extra-4.15.0-33-generic
167039  linux-modules-extra-4.15.0-39-generic
174305  firefox
179065  openjdk-11-jre-headless
194447  google-chrome-stable
236804  zoom
271127  linux-firmware

here are some things that I already tried, they didn't help:

sudo apt-get clean
sudo apt-get autoclean
sudo apt-get autoremove
sudo apt-get autoremove --purge
sudo apt-get remove --purge linux-image-X.X.XX-XX-generic # for old versions

sudo find / -xdev -name core -ls -o  -path "/lib*" -prune

$ dpkg -l "linux*{tools}*" |grep ^.i
dpkg-query: no packages found matching linux*{tools}*

I would be grateful for any assistance.

Edit: this is how my drive appears in gparted:

screenshot

So it looks like I have a 256G m2 drive and i installed the boot, root, and swap partitions there, with leftover space mounted at /m2. my /home directory is on a separate device.

So if I can't fix whatever is wrong with root, I'm wondering if I could increase its size by 1) delete /m2 2) delete swap 3) resize root 4) recreate swap. Would that work?

Edit #2:

du -h /var/lib/snapd/snaps

$ du -h /var/lib/snapd/snaps
4.0K    /var/lib/snapd/snaps/partial
2.8G    /var/lib/snapd/snaps
  • Your snap apps are using 11GB, that's where the problem lies. These are the apps installed via Ubuntu Store. Currently, it is using the storage from your root partition. – Bernard Wei Nov 30 '18 at 20:34
  • Check the compressed snap usage at /var/lib/snapd/snaps to see if the actual storage is taking up a lot of the root partition. – Bernard Wei Nov 30 '18 at 20:52
  • many thanks for getting back to me. i edited my post to show the output of "du -h /var/lib/snapd/snaps". how should i fix the problem? – erik Nov 30 '18 at 20:56
  • could i fix it by mounting /var elsewhere? my /home directory is mounted on a different disk with loads of free space, could i mount /var there? – erik Nov 30 '18 at 21:03
  • 1
    just a FYI: 15gb is enough only if you don't install many programs, as you require a lot of space to release-upgrade to the next version (unless your plan is nuke & install [clean]), the current wiki recommendation is 25gb. – guiverc Nov 30 '18 at 21:42
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i have a 256GB M2 drive on which i had installed boot, root, and swap, with leftover space mounted under /m2. then i have a 1TB drive on which i installed /home. snap filled up my /var directory.

i think the correct solution would have been to move /var to /home/var but i couldn't get that to work.

then i zapped swap and /m2, increased the size of root, and added back swap and /m2. but then i got errors relating to invalid sectors or corrupt disk, i can't remember exactly.

so then i stopped using the M2 drive altogether. i tried to shrink /home and to put boot, root, and swap at the end of the 1TB drive. but this got corrupted too. in the end i did a bare metal reinstall to the 1TB drive.

1

Boot from a live distro, shrink p4 partition, move p3 next to p4, resize p2

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