`E: Package 'dialog' has no installation candidate` on `pihole -up`

Help
1

I've been having trouble updating Pi-hole on Raspbian GNU/Linux 10 (buster). I haven't made any recent changes, aside from regular updates, so I'm unsure what the source of the problem is. I've run sudo apt-get update and sudo apt-get-upgrade and those both appear to be up-to-date.

Expected Behaviour:

I connect via ssh and run pihole -up and the update completes as expected.

Actual Behaviour:

I run pihole -up and receive the following output:

  [i] SELinux not detected
  [✓] Update local cache of available packages
  [i] Existing PHP installation detected : PHP version 7.3.19-1~deb10u1

  [✓] Checking apt-get for upgraded packages... up to date!

  [i] Checking for / installing Required dependencies for OS Check...
  [✓] Checking for grep
  [✓] Checking for dnsutils

  [✓] Supported OS detected
  [i] Checking for / installing Required dependencies for this install script...
  [✓] Checking for git
  [✓] Checking for iproute2
  [i] Checking for dialog (will be installed)
  [✓] Checking for ca-certificates
  [i] Waiting for package manager to finish (up to 30 seconds)
  [i] Processing apt-get install(s) for: dialog, please wait...

E: Package 'dialog' has no installation candidate

Can you please help me diagnose and resolve the problem? Thanks in advance for giving it a look!

Debug Token:

/mnCBwih8/

2

This looks very similar to Pi-Hole Update Dialog installation?! (in German, though).

What's the ouput of:

sudo apt-cache policy dialog

cat /etc/apt/sources.list
3

Thanks for the reply, I hadn't seen that other thread!

sudo apt-cache policy dialog gives me:

dialog:
  Installed: (none)
  Candidate: (none)
  Version table:

and cat /etc/apt/sources.list gives me:

#deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
4

Are you sure about that line?

If so, try removing the comment marker (#) at the start of just that line.

Afterwards, run

sudo apt-get update

sudo apt-cache policy dialog
1 Like
5

Good catch... I don't know how or why that was commented out. But I removed the comment marker, ran sudo apt-get update and now sudo apt-cache policy dialog is returning the following:

dialog:
  Installed: (none)
  Candidate: 1.3-20190211-1
  Version table:
     1.3-20190211-1 500
        500 http://raspbian.raspberrypi.org/raspbian buster/main armhf Packages

It looks like pihole -up is working as expected. I'll take a look and see if I can figure out how/why that line got commented out. But it at least looks like I'm able to update now without issue.

Thanks for the help!

6

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