You have been subscribed to a public bug:
I installed rygel and created a specific rygel user to run it with (as
directed by the docs). I then realized a specific user was not needed.
To reverse my steps, I ran deluser which proceeded to delete lots of
files that have nothing to do with the rygel user:
root@host:~# adduser --home /home/rygel --disabled-password --disabled-login
--gecos 'Rygel media server' rygel
root@host:~# sudo su - rygel
rygel@host:$ systemctl start rygel
rygel@host:$ exit
root@host:~# deluser --remove-home --remove-all-files rygel
Looking for files to backup/remove ...
/usr/sbin/deluser: Cannot handle special file /etc/systemd/system/mdm.service
/usr/sbin/deluser: Cannot handle special file
/etc/systemd/system/samba-ad-dc.service
/usr/sbin/deluser: Cannot handle special file
/etc/systemd/system/cgmanager.service
/usr/sbin/deluser: Cannot handle special file
/etc/systemd/system/cgproxy.service
/usr/sbin/deluser: Cannot handle special file /dev/vcsa7
/usr/sbin/deluser: Cannot handle special file /dev/vcsu7
/usr/sbin/deluser: Cannot handle special file /dev/vcs7
/usr/sbin/deluser: Cannot handle special file /dev/gpiochip0
/usr/sbin/deluser: Cannot handle special file /dev/dvdrw
/usr/sbin/deluser: Cannot handle special file /dev/dvd
/usr/sbin/deluser: Cannot handle special file /dev/cdrw
/usr/sbin/deluser: Cannot handle special file /dev/zfs
/usr/sbin/deluser: Cannot handle special file /dev/vhost-vsock
/usr/sbin/deluser: Cannot handle special file /dev/vhost-net
/usr/sbin/deluser: Cannot handle special file /dev/uhid
/usr/sbin/deluser: Cannot handle special file /dev/vhci
/usr/sbin/deluser: Cannot handle special file /dev/userio
/usr/sbin/deluser: Cannot handle special file /dev/nvram
/usr/sbin/deluser: Cannot handle special file /dev/btrfs-control
/usr/sbin/deluser: Cannot handle special file /dev/cuse
/usr/sbin/deluser: Cannot handle special file /dev/autofs
/usr/sbin/deluser: Cannot handle special file /dev/sde
/usr/sbin/deluser: Cannot handle special file /dev/sdd
/usr/sbin/deluser: Cannot handle special file /dev/sdc
/usr/sbin/deluser: Cannot handle special file /dev/sdb
/usr/sbin/deluser: Cannot handle special file /dev/sg5
/usr/sbin/deluser: Cannot handle special file /dev/sg4
/usr/sbin/deluser: Cannot handle special file /dev/sg3
/usr/sbin/deluser: Cannot handle special file /dev/sg2
/usr/sbin/deluser: Cannot handle special file /dev/vcsa6
/usr/sbin/deluser: Cannot handle special file /dev/vcsu6
/usr/sbin/deluser: Cannot handle special file /dev/vcs6
/usr/sbin/deluser: Cannot handle special file /dev/vcsa5
/usr/sbin/deluser: Cannot handle special file /dev/vcsu5
/usr/sbin/deluser: Cannot handle special file /dev/vcs5
/usr/sbin/deluser: Cannot handle special file /dev/vcsa4
/usr/sbin/deluser: Cannot handle special file /dev/vcsu4
/usr/sbin/deluser: Cannot handle special file /dev/vcs4
/usr/sbin/deluser: Cannot handle special file /dev/vcsa3
/usr/sbin/deluser: Cannot handle special file /dev/vcsu3
/usr/sbin/deluser: Cannot handle special file /dev/vcs3
/usr/sbin/deluser: Cannot handle special file /dev/vcsa2
/usr/sbin/deluser: Cannot handle special file /dev/vcsu2
/usr/sbin/deluser: Cannot handle special file /dev/vcs2
/usr/sbin/deluser: Cannot handle special file /dev/hidraw2
/usr/sbin/deluser: Cannot handle special file /dev/hidraw1
/usr/sbin/deluser: Cannot handle special file /dev/cdrom
/usr/sbin/deluser: Cannot handle special file /dev/hidraw0
/usr/sbin/deluser: Cannot handle special file /dev/fb0
/usr/sbin/deluser: Cannot handle special file /dev/i2c-5
/usr/sbin/deluser: Cannot handle special file /dev/i2c-4
/usr/sbin/deluser: Cannot handle special file /dev/i2c-3
/usr/sbin/deluser: Cannot handle special file /dev/i2c-2
/usr/sbin/deluser: Cannot handle special file /dev/i2c-1
/usr/sbin/deluser: Cannot handle special file /dev/i2c-0
/usr/sbin/deluser: Cannot handle special file /dev/rtc
/usr/sbin/deluser: Cannot handle special file /dev/stderr
/usr/sbin/deluser: Cannot handle special file /dev/stdout
/usr/sbin/deluser: Cannot handle special file /dev/stdin
/usr/sbin/deluser: Cannot handle special file /dev/sda6
/usr/sbin/deluser: Cannot handle special file /dev/sda5
/usr/sbin/deluser: Cannot handle special file /dev/sda3
/usr/sbin/deluser: Cannot handle special file /dev/sda2
/usr/sbin/deluser: Cannot handle special file /dev/sda1
/usr/sbin/deluser: Cannot handle special file /dev/sg1
/usr/sbin/deluser: Cannot handle special file /dev/sr0
/usr/sbin/deluser: Cannot handle special file /dev/sda
/usr/sbin/deluser: Cannot handle special file /dev/sg0
/usr/sbin/deluser: Cannot handle special file /dev/cpu_dma_latency
/usr/sbin/deluser: Cannot handle special file /dev/mcelog
/usr/sbin/deluser: Cannot handle special file /dev/rtc0
/usr/sbin/deluser: Cannot handle special file /dev/uinput
/usr/sbin/deluser: Cannot handle special file /dev/psaux
/usr/sbin/deluser: Cannot handle special file /dev/ppp
/usr/sbin/deluser: Cannot handle special file /dev/udmabuf
/usr/sbin/deluser: Cannot handle special file /dev/loop7
/usr/sbin/deluser: Cannot handle special file /dev/loop6
/usr/sbin/deluser: Cannot handle special file /dev/loop5
/usr/sbin/deluser: Cannot handle special file /dev/loop4
/usr/sbin/deluser: Cannot handle special file /dev/loop3
/usr/sbin/deluser: Cannot handle special file /dev/loop2
/usr/sbin/deluser: Cannot handle special file /dev/loop1
/usr/sbin/deluser: Cannot handle special file /dev/loop0
/usr/sbin/deluser: Cannot handle special file /dev/loop-control
/usr/sbin/deluser: Cannot handle special file /dev/hwrng
/usr/sbin/deluser: Cannot handle special file /dev/hpet
/usr/sbin/deluser: Cannot handle special file /dev/ttyprintk
/usr/sbin/deluser: Cannot handle special file /dev/ttyS31
/usr/sbin/deluser: Cannot handle special file /dev/ttyS30
/usr/sbin/deluser: Cannot handle special file /dev/ttyS29
/usr/sbin/deluser: Cannot handle special file /dev/ttyS28
/usr/sbin/deluser: Cannot handle special file /dev/ttyS27
/usr/sbin/deluser: Cannot handle special file /dev/ttyS26
/usr/sbin/deluser: Cannot handle special file /dev/ttyS25
/usr/sbin/deluser: Cannot handle special file /dev/ttyS24
/usr/sbin/deluser: Cannot handle special file /dev/ttyS23
/usr/sbin/deluser: Cannot handle special file /dev/ttyS22
/usr/sbin/deluser: Cannot handle special file /dev/ttyS21
/usr/sbin/deluser: Cannot handle special file /dev/ttyS20
/usr/sbin/deluser: Cannot handle special file /dev/ttyS19
/usr/sbin/deluser: Cannot handle special file /dev/ttyS18
/usr/sbin/deluser: Cannot handle special file /dev/ttyS17
/usr/sbin/deluser: Cannot handle special file /dev/ttyS16
/usr/sbin/deluser: Cannot handle special file /dev/ttyS15
/usr/sbin/deluser: Cannot handle special file /dev/ttyS14
/usr/sbin/deluser: Cannot handle special file /dev/ttyS13
/usr/sbin/deluser: Cannot handle special file /dev/ttyS12
/usr/sbin/deluser: Cannot handle special file /dev/ttyS11
/usr/sbin/deluser: Cannot handle special file /dev/ttyS10
/usr/sbin/deluser: Cannot handle special file /dev/ttyS9
/usr/sbin/deluser: Cannot handle special file /dev/ttyS8
/usr/sbin/deluser: Cannot handle special file /dev/ttyS7
/usr/sbin/deluser: Cannot handle special file /dev/ttyS6
/usr/sbin/deluser: Cannot handle special file /dev/ttyS5
/usr/sbin/deluser: Cannot handle special file /dev/ttyS4
/usr/sbin/deluser: Cannot handle special file /dev/ttyS3
/usr/sbin/deluser: Cannot handle special file /dev/ttyS2
/usr/sbin/deluser: Cannot handle special file /dev/ttyS1
/usr/sbin/deluser: Cannot handle special file /dev/ttyS0
/usr/sbin/deluser: Cannot handle special file /dev/ptmx
/usr/sbin/deluser: Cannot handle special file /dev/fuse
/usr/sbin/deluser: Cannot handle special file /dev/ecryptfs
/usr/sbin/deluser: Cannot handle special file /dev/snapshot
/usr/sbin/deluser: Cannot handle special file /dev/tty63
/usr/sbin/deluser: Cannot handle special file /dev/tty62
/usr/sbin/deluser: Cannot handle special file /dev/tty61
/usr/sbin/deluser: Cannot handle special file /dev/tty60
/usr/sbin/deluser: Cannot handle special file /dev/tty59
/usr/sbin/deluser: Cannot handle special file /dev/tty58
/usr/sbin/deluser: Cannot handle special file /dev/tty57
/usr/sbin/deluser: Cannot handle special file /dev/tty56
/usr/sbin/deluser: Cannot handle special file /dev/tty55
/usr/sbin/deluser: Cannot handle special file /dev/tty54
/usr/sbin/deluser: Cannot handle special file /dev/tty53
/usr/sbin/deluser: Cannot handle special file /dev/tty52
/usr/sbin/deluser: Cannot handle special file /dev/tty51
/usr/sbin/deluser: Cannot handle special file /dev/tty50
/usr/sbin/deluser: Cannot handle special file /dev/tty49
/usr/sbin/deluser: Cannot handle special file /dev/tty48
/usr/sbin/deluser: Cannot handle special file /dev/tty47
/usr/sbin/deluser: Cannot handle special file /dev/tty46
/usr/sbin/deluser: Cannot handle special file /dev/tty45
/usr/sbin/deluser: Cannot handle special file /dev/tty44
/usr/sbin/deluser: Cannot handle special file /dev/tty43
/usr/sbin/deluser: Cannot handle special file /dev/tty42
/usr/sbin/deluser: Cannot handle special file /dev/tty41
/usr/sbin/deluser: Cannot handle special file /dev/tty40
/usr/sbin/deluser: Cannot handle special file /dev/tty39
/usr/sbin/deluser: Cannot handle special file /dev/tty38
/usr/sbin/deluser: Cannot handle special file /dev/tty37
/usr/sbin/deluser: Cannot handle special file /dev/tty36
/usr/sbin/deluser: Cannot handle special file /dev/tty35
/usr/sbin/deluser: Cannot handle special file /dev/tty34
/usr/sbin/deluser: Cannot handle special file /dev/tty33
/usr/sbin/deluser: Cannot handle special file /dev/tty32
/usr/sbin/deluser: Cannot handle special file /dev/tty31
/usr/sbin/deluser: Cannot handle special file /dev/tty30
/usr/sbin/deluser: Cannot handle special file /dev/tty29
/usr/sbin/deluser: Cannot handle special file /dev/tty28
...
etc.
** Affects: adduser (Ubuntu)
Importance: Undecided
Status: New
** Tags: security
--
catastrophic bug with deluser command -- destroys large number of system files
https://bugs.launchpad.net/bugs/1890520
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seeded packages, which is subscribed to adduser in Ubuntu.
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