since updating to edgy, HP Deskjet 600 is not detected at all

Can you provide the output of the printingbuginfo script, it can be found here: https://wiki.ubuntu.com/PrintingBugInfoScript.

Please also provide the output of the following command:
$ lpinfo -v

== System information ==
Ubuntu Release: 6.10 (edgy)
Architecture : i686
Kernel : 2.6.17-7-386
Locale : LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8, LC_PAPER=de_DE.UTF-8
/etc/papersize: a4

== Configured printers ==

== Versions of important printing packages ==
ii cupsys 1.2.3-0ubuntu1 Common UNIX Printing System(tm) - server
ii cupsys-driver-gutenprint 5.0.0~rc2-0ubuntu6 printer drivers for CUPS
ii foomatic-db 20060530-1 linuxprinting.org printer support - database
ii foomatic-db-engine 3.0.2-20060530-2ubuntu2 linuxprinting.org printer support - programs
ii foomatic-db-gutenprint 5.0.0~rc2-0ubuntu6 linuxprinting.org printer support - database
ii foomatic-db-hpijs 1.5-20060530-1 linuxprinting.org printer support - database
ii foomatic-filters 3.0.2-20060530-1 linuxprinting.org printer support - filters
ii foomatic-filters-ppds 20060530-2 linuxprinting.org printer support - prebuilt
ii gs-common 0.3.9ubuntu1 Common files for different Ghostscript relea
ii gs-esp 8.15.2.dfsg.0ubuntu1-0ubuntu2 The Ghostscript PostScript interpreter - ESP
ii hpijs 2.1.10+0.9.11-2ubuntu7 HP Linux Printing and Imaging - gs IJS drive
ii hpijs-ppds 2.1.10+0.9.11-2ubuntu7 HP Linux Printing and Imaging - HPIJS PPD fi
ii ijsgutenprint 5.0.0~rc2-0ubuntu6 inkjet server - Ghostscript driver for Guten

Created with printingbuginfo script v1.2 (https://wiki.ubuntu.com/PrintingBugInfoScript)

beerockxs@awesome:~$ lpinfo -v
network socket
network beh
network bluetooth
network http
network ipp
network lpd
direct parallel:/dev/lp0
direct canon:/dev/lp0
direct epson:/dev/lp0
network smb

Can you post the output of

sudo lsmod
sudo cat /proc/sys/dev/parport/parport*/autoprobe*

beerockxs@awesome:~$ sudo lsmod
Password:
Module Size Used by
isofs 36920 1
udf 88068 0
binfmt_misc 11912 1
rfcomm 39192 0
hidp 32128 2
l2cap 23428 10 rfcomm,hidp
bluetooth 49380 5 rfcomm,hidp,l2cap
radeon 117536 2
drm 73108 3 radeon
cpufreq_userspace 4372 0
cpufreq_stats 5892 0
freq_table 4996 1 cpufreq_stats
cpufreq_powersave 2048 0
cpufreq_ondemand 7072 0
cpufreq_conservative 7200 0
video 16260 0
tc1100_wmi 7428 0
sony_acpi 5644 0
pcc_acpi 13312 0
hotkey 10532 0
dev_acpi 11140 0
container 4736 0
button 6928 0
acpi_sbs 22412 0
battery 10372 1 acpi_sbs
ac 5508 1 acpi_sbs
i2c_acpi_ec 5376 1 acpi_sbs
nls_iso8859_1 4352 2
nls_cp437 6016 3
vfat 13440 2
fat 54940 1 vfat
dm_mod 60344 1
md_mod 79252 0
ipv6 259168 14
af_packet 21896 2
lp 11972 0
i2c_viapro 8980 0
i2c_core 22416 2 i2c_acpi_ec,i2c_viapro
via_ircc 27668 0
snd_cmipci 36384 4
gameport 15496 1 snd_cmipci
irda 202300 1 via_ircc
tsdev 8384 0
shpchp 41112 0
pci_hotplug 31540 1 shpchp
crc_ccitt 2304 1 irda
snd_pcm_oss 46336 0
snd_mixer_oss 18688 1 snd_pcm_oss
snd_pcm 81160 3 snd_cmipci,snd_pcm_oss
snd_page_alloc 10632 1 snd_pcm
snd_opl3_lib 11008 1 snd_cmipci
snd_timer 23300 3 snd_pcm,snd_opl3_lib
snd_hwdep 9860 1 snd_opl3_lib
snd_mpu401_uart 8832 1 snd_cmipci
snd_rawmidi 25728 1 snd_mpu401_uart
snd_seq_device 8972 2 snd_opl3_lib,snd_rawmidi
snd 55812 20 snd_cmipci,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_opl3_lib,snd_timer,snd_hwdep,snd_mpu401_uart,snd_rawmidi,snd_seq_device
soundcore 10080 1 snd
serio_raw 7300 0
floppy 60932 0
parport_pc 36388 1
parport 37576 2 lp,parport_pc
evdev 10496 1
pcspkr 3072 0
via_agp 10496 1
agpgart 33712 2 drm,via_agp
rtc 12724 0
8139cp 22656 0
8139too 27264 0
mii 6016 2 8139cp,8139too
psmouse 40328 0
ext3 139400 2
jbd 55956 1 ext3
uhci_hcd 23304 0
usbcore 131200 2 uhci_hcd
ide_generic 1536 0
ide_disk 17536 6
ide_cd 32672 1
cdrom 37920 1 ide_cd
via82cxxx 9604 0 [permanent]
generic 4868 ...

er, that's supposed to be
sudo cat /proc/sys/dev/parport/parport*/autoprobe*
does not produce any output.

This looks like a kernel-level problem for me. All kernel modules for the parallel port are loaded (parport, parport_pc, and lp), but the printer's ID is not appearing in any of the /proc/sys/dev/parport/parport*/autoprobe* files.

As you had this printer already working on your machine, I assume that the BIOS settings for your parallel port are correct for bi-directional access.

Yes, I did not change anything in the BIOS.

Can you add the printer with the web interface of CUPS?

Go to http://localhost:631/ and click on "Administration". If your printer or at least the first parallel port is shown, click on the appropriate "Add this printer" button and choose the model on the next screens. When asked for user name and password, enter your user name and your password.

If your printer/the parallel port does not appear, click "Add Printer" at the top of the page and fill in the fields on the following screens. In the "Device" step choose "LPT #1", in the following steps chose your printer model. Does this work?

The webinterface didn't detect it automatically, but after adding it manually through that, it seems to print fine, but no ink ends up on the paper, although the ink cartridge is not empty. I think my printer may be broken :-(

[Expired for gnome-cups-manager (Ubuntu) because there has been no activity for 60 days.]