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In order to install HPLIP 3.20.6 I need to install the dependency python3-pyqt4.

error: A required dependency 'python3-pyqt4 (PyQt 4- Qt interface for Python (for Qt version 4.x))' is still missing.
error: Installation cannot continue without this dependency.
error: Please manually install this dependency and re-run this installer.

When trying to install through apt I get the error that it cannot be found.

E: Unable to locate package python3-pyqt4

How can I install this dependency?

I need to install HPLIP 3.20.5 or greater in order to be able to use a new printer so any help in resolving this is much appreciated. Thank you.

Edit: To further clarify. The printer I am trying to connect to is HP Envy 6020. On the HPLIP list of supported devices the Envy 6000 series is supported but it requires a minimum of 3.20.5 HPLIP to run. Ergo, I need to install that version and it is requiring python3-pyqt4 in order to install.

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  • Is there a reason that the version that comes with Mint 20 (3.20.3+dfsg0-2) doesn't work for you? Commented Jul 29, 2020 at 18:33
  • Your best option is to install the QT4 PPA, as outlined here: ubuntuhandbook.org/index.php/2020/07/install-qt4-ubuntu-20-04 Commented Jul 29, 2020 at 20:04
  • Updated question with explanation why I need 3.20.5. Will look into PPA now, thank you. Commented Jul 30, 2020 at 9:03
  • Thank you for the suggestion ajgringo. Unfortunately the qt4 PPA doesn't include the python3-pyqt4 package. Commented Jul 30, 2020 at 10:15
  • You should contact HP support and ask why their latest driver needs such an outdated dependency. Does this recent post help any: askubuntu.com/questions/1233752/hplip-requires-pyqt4 Commented Jul 30, 2020 at 14:45

2 Answers 2

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Qt4 has been replaced by Qt5 in Mint 20. Use:

apt install python3-pyqt5

It should be compatible.

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  • Ah. Ok, installing python3-pyqt5 worked easy as pie. However, the installation for HPLIP is still demanding pyqt4. Is there a method to install that older version? Commented Jul 29, 2020 at 17:29
  • If you absolutely need Qt4, it would probably be better to use Linux Mint 19 where Qt4 should be available. Commented Jul 29, 2020 at 18:10
  • Using the PPA so that you can use Qt4 on Mint 20 will work ( see comment of @ajgringo619 in your question). But HPLIP 3.20.3 works with Qt5 so 3.20.5 certainly also works. I expect that you are installing it incorrectly. Please add the procedure you are using in your question. Commented Jul 29, 2020 at 23:52
  • HPLIP 3.20.3 works out the box and is the one that comes with Mint 20. However, for the printer I am trying to connect to it requires a min of 3.20.5, hence my question on upgrades. Thank you, I will check out the comment on the Q Commented Jul 30, 2020 at 8:48
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An alternative solution. Set up the printer as a driverless printer.

With some help on the Linux Mint forum I was able to get the printer working without the use of HPLIP. This is through, as I learned, the printers ability to support driverless printing. As it may help someone in the future this is the procedure to follow.

  1. Make sure the printer and computer are on the same wireless network

  2. Use the avavi-browse commands to search for devices on the local wireless network. Use the CUPS driverless and lpstat commands to list relevant printer status

avahi-browse -rt _ipp._tcp
avahi-browse -rt _uscan._tcp
driverless
lpstat -l -e

Example avahi-browse -rt _ipp._tcp output:

➜  ~ avahi-browse -rt _ipp._tcp
+ wlp1s0 IPv6 HP ENVY 6000 series [B68C8C]                  Internet Printer     local
+ wlp1s0 IPv4 HP ENVY 6000 series [B68C8C]                  Internet Printer     local
= wlp1s0 IPv4 HP ENVY 6000 series [B68C8C]                  Internet Printer     local
   hostname = [HP3822E2B68C8C.local]
   address = [192.168.1.190]
   port = [631]
   txt = ["Fax=F" "mopria-certified=2.0" "Scan=T" "kind=document,envelope,photo,postcard" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS300-600,SRGB24,OB9,OFU0,W8-16,DEVW8-16,DEVRGB24-48,ADOBERGB24-48,DM3,IS1,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,image/jpeg,image/urf,image/pwg-raster,application/PCLm" "Duplex=T" "Color=T" "usb_MDL=ENVY 6000 series" "usb_MFG=HP" "ty=HP ENVY 6000 series" "product=(HP ENVY 6000 series)" "UUID=9dddcf7d-2ef9-51a5-8be4-be1e5e3ebfc2" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=20" "note=" "adminurl=http://HP3822E2B68C8C.local./#hId-pgAirPrint" "txtvers=1"]
= wlp1s0 IPv6 HP ENVY 6000 series [B68C8C]                  Internet Printer     local
   hostname = [HP3822E2B68C8C.local]
   address = [192.168.1.190]
   port = [631]
   txt = ["Fax=F" "mopria-certified=2.0" "Scan=T" "kind=document,envelope,photo,postcard" "URF=CP1,MT1-2-8-9-10-11,PQ3-4-5,RS300-600,SRGB24,OB9,OFU0,W8-16,DEVW8-16,DEVRGB24-48,ADOBERGB24-48,DM3,IS1,V1.4,FN3" "PaperMax=legal-A4" "pdl=application/vnd.hp-PCL,image/jpeg,image/urf,image/pwg-raster,application/PCLm" "Duplex=T" "Color=T" "usb_MDL=ENVY 6000 series" "usb_MFG=HP" "ty=HP ENVY 6000 series" "product=(HP ENVY 6000 series)" "UUID=9dddcf7d-2ef9-51a5-8be4-be1e5e3ebfc2" "rp=ipp/print" "TLS=1.2" "qtotal=1" "priority=20" "note=" "adminurl=http://HP3822E2B68C8C.local./#hId-pgAirPrint" "txtvers=1"]

Example avahi-browse -rt _uscan._tcp output:

➜  ~ avahi-browse -rt _uscan._tcp
+ wlp1s0 IPv4 HP ENVY 6000 series [B68C8C]                  _uscan._tcp          local
+ wlp1s0 IPv6 HP ENVY 6000 series [B68C8C]                  _uscan._tcp          local
= wlp1s0 IPv4 HP ENVY 6000 series [B68C8C]                  _uscan._tcp          local
   hostname = [HP3822E2B68C8C.local]
   address = [192.168.1.190]
   port = [8080]
   txt = ["mopria-certified-scan=1.2" "duplex=F" "is=platen" "cs=binary,color,grayscale" "pdl=application/octet-stream,application/pdf,image/jpeg" "ty=HP ENVY 6000 series" "rs=eSCL" "representation=images/printer.png" "vers=2.63" "UUID=9dddcf7d-2ef9-51a5-8be4-be1e5e3ebfc2" "note=" "adminurl=http://HP3822E2B68C8C.local." "txtvers=1"]
= wlp1s0 IPv6 HP ENVY 6000 series [B68C8C]                  _uscan._tcp          local
   hostname = [HP3822E2B68C8C.local]
   address = [192.168.1.190]
   port = [8080]
   txt = ["mopria-certified-scan=1.2" "duplex=F" "is=platen" "cs=binary,color,grayscale" "pdl=application/octet-stream,application/pdf,image/jpeg" "ty=HP ENVY 6000 series" "rs=eSCL" "representation=images/printer.png" "vers=2.63" "UUID=9dddcf7d-2ef9-51a5-8be4-be1e5e3ebfc2" "note=" "adminurl=http://HP3822E2B68C8C.local." "txtvers=1"]

Example driverless output:

➜  ~ driverless
ipp://HP%20ENVY%206000%20series%20%5BB68C8C%5D._ipp._tcp.local/

Example lpstat -l -e output:

➜  ~ lpstat -l -e 
HP_ENVY_6000_series_B68C8C_ permanent ipp://localhost/printers/HP_ENVY_6000_series_B68C8C_ implicitclass://HP_ENVY_6000_series_B68C8C_/
  1. Using the information from the previous commands setup the driverless printer.

The command to run is:

lpadmin -p [PRINTER-NAME] -v [URI] -E -m everywhere

PRINTER-NAME is merely replaced with the name you wish to give.

The URI is replaced with the URI of the printer. There are two methods for this. You can use the output of the driverless command. This initially worked for me until I restarted the computer and then it stopped working. The other option is to use the IP listed from the avahi-browse command in the format ipp://[IP]/ipp/print to point to the exact location of the printer. This IP can be double checked by logging into your router. Example of full command:

➜  ~ lpadmin -p envy6000 -v ipp://192.168.1.190:631/ipp/print -E -m everywhere
  1. Print a test page to make sure it works

➜ ~ lp -d envy6000 /etc/nsswitch.conf

That should be it. It should now print through all programs and be found in the Printers dialogue box.

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