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10

Reinstalling Ubuntu without formatting partition - what folders are deleted?

rated 0 times [ 10] [ 0] / answers: 1 / hits: 6161 / 1 Year ago, sat, april 8, 2023, 10:25:14

When re-installing Ubuntu on a partition where an existing Ubuntu installation already exists, and not choosing to format the partition, the installer shows a warning message before it begins installing:

The file system on /dev/sda5 assigned to / has not been marked for formatting. Directories containing system files (/etc, /lib, /usr, /var, ...) that already exist under any defined mountpoint will be deleted during the install.

Please ensure that you have backed up any critical data before installing.

The list of "system directories" here does not seem complete. Furthermore, I would expect /home to be a system directory, but from experience I know that /home is not erased.

What is the complete list of directories that will be removed during install?

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leddre

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answered 1 Year ago fittecanap · Accepted Answer

I wasn't able to find a hardcoded list in the ubiquity source code. The documentation says that partitioning is handled by d-i (debian installer) code to avoid duplication and maintenance effort. But I wasn't able to find an answer in the related packages or the Debian documentation.

Fortunately /var/log/syslog, respectively /var/log/installer/syslog post installation, contains useful information about ubiquity and the installation process. Here is an excerpt from a 12.04 install over a 12.04 install in my VM:

May 27 21:20:12 ubuntu ubiquity[8109]: switched to page partman

May 27 21:20:35  ubiquity[8109]: last message repeated 5 times

May 27 21:20:35 ubuntu kernel: [  598.116238] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)

May 27 21:20:35 ubuntu ubiquity: umount: /tmp/tmp.5jn9BTMDwz: device is busy.

May 27 21:20:35 ubuntu ubiquity:         (In some cases useful info about processes that use

May 27 21:20:35 ubuntu ubiquity:          the device is found by lsof(8) or fuser(1))

May 27 21:20:35 ubuntu ubiquity: 

May 27 21:20:37 ubuntu ubiquity[8109]: debconffilter_done: ubi-partman (current: ubi-partman)

May 27 21:20:37 ubuntu ubiquity[8109]: Step_before = stepPartAdvanced

May 27 21:20:37 ubuntu clock-setup: Sun May 27 21:20:37 UTC 2012

May 27 21:20:37 ubuntu clock-setup: rdate: adjust local clock by -0.063701 seconds

May 27 21:20:40 ubuntu ubiquity[8109]: switched to page timezone

May 27 21:20:42 ubuntu kernel: [  605.076359] Adding 784380k swap on /dev/sda5.  Priority:-1 extents:1 across:784380k 

May 27 21:20:42 ubuntu kernel: [  605.225583] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)

May 27 21:20:51 ubuntu ubiquity: not installable: 

May 27 21:20:51 ubuntu ubiquity: version mismatch: 

May 27 21:20:51 ubuntu clear_partitions: Considering /,/dev/sda1. 

May 27 21:20:51 ubuntu kernel: [  614.038996] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)

May 27 21:20:51 ubuntu clear_partitions: Removing bin from / (/dev/sda1).

May 27 21:20:51 ubuntu clear_partitions: Removing dev from / (/dev/sda1).

May 27 21:20:51 ubuntu clear_partitions: Removing etc from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing lib from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing lib64 from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing proc from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing sbin from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing sys from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing usr/bin from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing usr/games from / (/dev/sda1).

May 27 21:20:52 ubuntu clear_partitions: Removing usr/include from / (/dev/sda1).

May 27 21:20:53 ubuntu clear_partitions: Removing usr/lib from / (/dev/sda1).

May 27 21:20:53 ubuntu clear_partitions: Removing usr/not-formatted from / (/dev/sda1).

May 27 21:20:53 ubuntu clear_partitions: Removing usr/sbin from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing usr/share from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/backups from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/cache from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/crash from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/games from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/lib from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/lock from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/log from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/mail from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/not-formatted from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/opt from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/run from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/spool from / (/dev/sda1).

May 27 21:21:02 ubuntu clear_partitions: Removing var/tmp from / (/dev/sda1).

May 27 21:21:02 ubuntu kernel: [  625.522422] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: errors=remount-ro

Basically the directories bin, dev, etc, lib, lib32, lib64, proc, sbin and sys are deleted as are the contents of usr and var (/usr/local and /var/local seem to be an exception, but test folders I had in usr and var were deleted). The boot directory does not seem to be deleted and is just overwritten by the packages related to grub and the kernel.