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klaudio123
June 10th, 2013, 01:00 PM
For my ubuntu usb distribution I bought an 8GB key
and set up 4GB as reserved extra space but during update
process ubuntu warned:
not enough space, please use 'clean' command to
free up memory.
(issue 1)
I followed the advice and used the command:
'sudo apt-get clean' to free up memory but I wonder
where temporary and old files are(I mean which folders
contain them)and which commands to use to delete them,
in order to free up more memory.
(issue 2)
I also followed the advice issuing to use 'Disk Usage
Analyzer' but I don't know how data is organized.
Where can I find a table or and explanation about
the content of all folders of ubuntu file system?
(issue 3)
Then I also decided to investigate how space is used.
I opened my ubuntu usb key on ubuntu CD session, so I
found my original system in casper folder(700 MB) +
'casper-rw' file(2.9 GB) in main usb folder containing
probably all updates.
I ask for confirmation about this.
(issue 4)
When I built my usb distribution I chose the option to
set up a reserved extra space for settings and documents,
but when I run my usb ubuntu I cannot access them as
a partition, however I can access my 'home' folder
from launcher, but as I cannot access my reserved extra
space as a partition I don't know which settings are
saved.
As my 'casper-rw' file is about 2.9 GB I suspect
that it represents my reserved extra space file(maybe
this extra space is fully contained in a unique file),
so containing all settings, updates and home folder.
Or maybe updates are not counted as reserved extra
space but still contained in file casper-rw.
Which is the truth? Which folders I find in
'Disk Usage Analyzer' are contained in my reserved
extra space?
Can anyone please address this issue?

oldfred
June 10th, 2013, 05:07 PM
RecoverLostDiskSpace
https://help.ubuntu.com/community/RecoverLostDiskSpace
HOWTO: Recover Lost Disk Space - drs305
http://ubuntuforums.org/showthread.php?t=1122670
http://ubuntuforums.org/showthread.php?t=898573
HOWTO: Cleaning up all those unnecessary junk files...
http://ubuntuforums.org/showthread.php?t=140920
Caution deborphan will delete anything you manually installed. See comment:

I have never liked Disk Usage Analyzer. In my 25GB / (root) partition it shows 240GB. Which is somewhat correct as I also link in two other 100GB partitions, but I usually want to know details of each partition not the sum.
This shows by partition.
df -H

If you just have a installer with persistence it may be different.

Pros & cons of persistent install over direct install to flashdrives - C.S.Cameron
http://ubuntuforums.org/showthread.php?t=2133067
http://ubuntuforums.org/showthread.php?t=1655412

With persistence you cannot update system as it will still install as originally downloaded. But you can save added drivers or your files.


Linux Standard Base details
http://refspecs.linux-foundation.org/LSB_3.2.0/LSB-Core-generic/LSB-Core-generic/book1.html

Explanation of file structure
http://www.pathname.com/fhs/pub/fhs-2.3.html
http://www.tuxfiles.org/linuxhelp/linuxdir.html
http://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard
http://en.wikipedia.org/wiki/Linux_Standard_Base