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When I woke up this morning, I found my root had filled overnight

du -hx --max-depth=1 /



132M    /boot  

4.0K    /media  

16K /lost+found  

16M /root  

702M    /lib  

4.0K    /OLDHOME  

8.2G    /usr  

73M /etc  

4.0K    /srv  

11M /sbin  

4.0K    /selinux  

8.0K    /.config  

4.0K    /cdrom  

4.6G    /var  

181M    /opt  

4.0K    /mnt  

9.3M    /bin  

4.0K    /lib64  

14G /  

The space is used by /var/cache/polipo (2.7G). How can I clean this up safely?

I tried restarts=>didn't work

Used bleachbit=>the space is not detected in the cleanup preview

PS: I did rm -rf youtube inside /var/cache/polipo and it freed up 2G space. Dunno if it was safe though

Polipo, a web caching program may store a lot of data in an on-disk cache.

One way to clear this up is to issue the command sudo polipo -x - this will cause polipo to clear the local disk cache.

Method 1:

sudo apt-get autoclean

sudo apt-get autoremove

Method 2:

Launch your bleachbit as root user : no space in disk; sudo apt-get clean not working

Try cleaning ubuntu unnecesarry files using bleachbit.
It is a tool that will help you clean your cache, temp files, cookies and it has other features also...

To install it:

sudo apt-get install bleachbit

The most powerful of all commands to clean the cache for command line users is of course

sudo apt clean

Which will also delete all the cached files.

It sounds so obvious, and yet chances are you haven’t done this.

By default Ubuntu keeps every update it downloads and installs in a cache on your disk, just in case you ever need it again.

This is useful if you regularly add and remove apps, find yourself needing to reconfigure/reinstall a specific package, or simply have a poor connection.

But the flip side is that the apt package cache can quickly swell to several hundred MBs. This command tells you how big your apt cache is:

du -sh /var/cache/apt/archives

To clean the apt cache on Ubuntu simply run the following command.

sudo apt-get clean

The apt clean command removes ALL packages kept in the apt cache, regardless of age or need. If you’re on a slow, capped or intermittent connection you may want to consider skipping this step.

(https://www.omgubuntu.co.uk/2016/08/5-ways-free-up-space-on-ubuntu)

I couldn't find any Ubuntu specific documentation on "/var/cache" although only spent a couple of minutes on it. Based on its name and the answers to a related question, I'm comfortable manually deleting files from there.

First, I had a look at the worst offending applications (directories):

sudo du -hs /var/cache/* | sort -h

And I saw that they were clearly these two:

1.1G    /var/cache/mock

1.5G    /var/cache/lxc

I don't plan to use mock or lxc in the next few weeks, so I went ahead and did:

sudo rm -rf /var/cache/mock/*

sudo rm -rf /var/cache/lxc

And all is good.