garyh@HPLap:~$ cups-config --version
2.2.7

garyh@HPLap:~$ lpinfo -v
lpinfo: Bad file descriptor

garyh@HPLap:~$ lpstat -t
scheduler is not running
no system default destination
lpstat: Bad file descriptor
lpstat: Bad file descriptor
lpstat: Bad file descriptor
lpstat: Bad file descriptor
lpstat: Bad file descriptor

I was researching and learned the above. My printer-scanner HP 3520 is available via "Simple Scan" from the menu BUT I cannot print anything. I've uninstalled and re-installed HPLIP. Going to the settings-printers only gives option to "connect" and that /run/cups/cups.sock gives me "Cups server error".
Don't know how to proceed now.

It appears that cupsd is not running. Which distro are you using?

1 members found this post helpful.

Linux mint 19.3 Tricia

Ok, try
and report back if any errors etc

It should be enabled already, but if not this will get it started at boot

1 members found this post helpful.

start cups .......no errors, but no change
enable cups (Re-booted)...no errors, but no change...'failed to connect to server'

1 members found this post helpful.

Wen requesting a "Simple scan" User@HPLap recognizes HP Deskjet_3250_series, but when it comes to printing the print side-note is "Print to file" or "Generic Printer" and neither works.

my address is 127.0.0.53

How is the printer connected i.e USB or wireless?

Since simple scan recognizes the printer so connectivity is not a problem.

The min version of hplip required by the printer is 3.12.6 and I believe Mint installs 3.19.3 by default so setup should not be a problem.

Does the output of this command show active running?

systemctl status cups

usb

/var/log/cups$ systemctl status cups
● cups.service - CUPS Scheduler
Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
Active: failed (Result: start-limit-hit) since Thu 2020-07-02 20:13:10 EDT; 26min ago
Docs: man:cupsd(8)
Main PID: 1095 (code=killed, signal=TERM)

Jul 02 20:13:10 HPLap systemd[1]: cups.service: Service hold-off time over, scheduling restart.
Jul 02 20:13:10 HPLap systemd[1]: cups.service: Scheduled restart job, restart counter is at 4.
Jul 02 20:13:10 HPLap systemd[1]: Stopped CUPS Scheduler.
Jul 02 20:13:10 HPLap systemd[1]: Started CUPS Scheduler.
Jul 02 20:13:10 HPLap systemd[1]: cups.service: Service hold-off time over, scheduling restart.
Jul 02 20:13:10 HPLap systemd[1]: cups.service: Scheduled restart job, restart counter is at 5.
Jul 02 20:13:10 HPLap systemd[1]: Stopped CUPS Scheduler.
Jul 02 20:13:10 HPLap systemd[1]: cups.service: Start request repeated too quickly.
Jul 02 20:13:10 HPLap systemd[1]: cups.service: Failed with result 'start-limit-hit'.
Jul 02 20:13:10 HPLap systemd[1]: Failed to start CUPS Scheduler.

What happened was ... I tried to pipe a cat command to lp0. (unrecognized and suggested "lpr" cups-bsd.
I apt install lpr and see that cups was removed. (mistake)
I apt remove lpr -and- apt install cups-bsd (I then go to my email and begin following your suggestion.

Make sure /etc/cups/cupsd.conf exists. If there is a /etc/cups/cupsd.conf.default but no cupsd.conf then copy the default and try restarting cups.

lp0 references a legacy hardware parallel port. cups has a usb back end which communicates directly with the printer.

1 members found this post helpful.

root@HPLap:/etc/cups# ls -l
total 88
-rw-rwxrwx 1 root lp 108 Jun 21 21:49 classes.conf
-rw-rwxrwx 1 root root 26954 May 9 2019 cups-browsed.conf
-rw-rwxrwx 1 root lp 21 Jun 30 13:51 cupsd.conf
-rw-rwxrwx 1 root lp 4571 Jun 30 13:50 cupsd.conf.O
-rw-rwxrwx 1 root root 2923 Aug 16 2019 cups-files.conf
drwxr-xr-x 2 root root 4096 Aug 16 2019 interfaces
drwxr-xr-x 2 root lp 4096 Jun 21 22:15 ppd
-rw-rwxrwx 1 root lp 552 Jun 21 22:16 printers.conf
-rw-rwxrwx 1 root lp 552 Jun 21 21:49 printers.conf.O
-rw-rwxrwx 1 root root 240 Dec 13 2019 raw.convs
-rw-rwxrwx 1 root root 211 Dec 13 2019 raw.types
-rw-rwxrwx 1 root root 142 Aug 16 2019 snmp.conf
drwx------ 2 root lp 4096 Aug 16 2019 ssl
-rw-rwxrwx 1 root lp 1222 Jun 30 13:51 subscriptions.conf
-rw-rwxrwx 1 root lp 930 Jun 30 13:50 subscriptions.conf.O
root@HPLap:/etc/cups# open /etc/cups/cupsd.conf
root@HPLap:/etc/cups# Listen

Command 'Listen' not found, did you mean:

command 'listen' from deb ruby-listen

Try: apt install <deb name>

root@HPLap:/etc/cups# listen
Traceback (most recent call last):
5: from /usr/bin/listen:4:in `<main>'
4: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
3: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
2: from /usr/lib/ruby/vendor_ruby/listen/cli.rb:1:in `<top (required)>'
1: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- thor (LoadError)
root@HPLap:/etc/cups#

This is not a valid command. If you want to check cups.conf use an editor (eg nano) or the ‘cat’ command to view.

1 members found this post helpful.

I do not have cups.conf ... cupsd.conf instead........
-------------------------------
root@HPLap:/etc/cups# sudo cat /etc/cups/cupsd.conf
PreserveJobFiles Yes
-------------------------------