# CM4 8GB/32GB eMMC, official Bullseye image: error installing upgrade to devterm-thermal-printer

**URL:** <https://forum.clockworkpi.com/t/cm4-8gb-32gb-emmc-official-bullseye-image-error-installing-upgrade-to-devterm-thermal-printer/9689>\
**Category:** Firmware and Apps\
**Created:** [March 1, 2023, 8:09am UTC](https://forum.clockworkpi.com/t/cm4-8gb-32gb-emmc-official-bullseye-image-error-installing-upgrade-to-devterm-thermal-printer/9689 "2023-03-01T08:09:38Z")\
**Posts on this page:** 1\
**Showing post:** 20

<div class="post-metadata">

**Author:** ![adcockm](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/adcockm/32/1664_2.png) [@adcockm](https://forum.clockworkpi.com/u/adcockm)\
**Post date:** [April 29, 2023, 10:23am UTC](https://forum.clockworkpi.com/t/cm4-8gb-32gb-emmc-official-bullseye-image-error-installing-upgrade-to-devterm-thermal-printer/9689/20 "2023-04-29T10:23:07Z")

</div>

Ok, I got my printer working again, after using these commands to get information about what was installed:

```auto
apt-cache policy devterm-thermal-printer
apt-cache policy devterm-thermal-printer-cm4
apt-cache policy devterm-thermal-printer-cups

```

In my case, after updating it only had …-printer and …-printer-cups installed. But …printer-cm4 was NOT installed. When I installed …printer-cm4, it removed …printer. But THAT caused printing to work again!

So apparently with the CM4 based Devterm, we don’t want to have devterm-thermal-printer installed and ONLY want to have devterm-thermal-printer-cm4 and devterm-thermal-printer-cups installed.

Here’s what things look like for my (working) printer now:

```auto
cpi@devterm-cm4:~ $ apt-cache policy devterm-thermal-printer
devterm-thermal-printer:
  Installed: (none)
  Candidate: 0.38
  Version table:
     0.38 500
        500 https://raw.githubusercontent.com/clockworkpi/apt/main/debian stable/main arm64 Packages
cpi@devterm-cm4:~ $ apt-cache policy devterm-thermal-printer-cm4
devterm-thermal-printer-cm4:
  Installed: 0.11
  Candidate: 0.11
  Version table:
 *** 0.11 500
        500 https://raw.githubusercontent.com/clockworkpi/apt/main/debian stable/main arm64 Packages
        100 /var/lib/dpkg/status
cpi@devterm-cm4:~ $ apt-cache policy devterm-thermal-printer-cups
devterm-thermal-printer-cups:
  Installed: 0.12.1
  Candidate: 0.12.1
  Version table:
 *** 0.12.1 500
        500 https://raw.githubusercontent.com/clockworkpi/apt/main/debian stable/main arm64 Packages
        100 /var/lib/dpkg/status

```

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