Public bug reported:
Changing `APT::Periodic::Update-Package-Lists` to a value not in the
data model `model_updates_interval` in `/usr/share/software-
properties/gtkbuilder/main.ui` calls an invalid method, crashing the
program.
```
$ cat /etc/apt/apt.conf.d/10periodic
APT::Periodic::Update-Package-Lists "3";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "0";
APT::Periodic::Unattended-Upgrade "0";
$ software-properties-gtk
Traceback (most recent call last):
File "/usr/bin/software-properties-gtk", line 100, in <module>
app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options,
file=file)
File
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
line 231, in __init__
self.init_auto_update()
File
"/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py",
line 310, in init_auto_update
self.combobox_update_interval.append_text(_("Every %s days")
AttributeError: 'ComboBox' object has no attribute 'append_text'
```
Occurs in:
```
$ lsb_release -rd
Description: Ubuntu 21.04
Release: 21.04
$ apt-cache policy software-properties-gtk
software-properties-gtk:
Installed: 0.99.10.2
Candidate: 0.99.10.2
Version table:
*** 0.99.10.2 500
500 http://us.archive.ubuntu.com/ubuntu hirsute-updates/main amd64
Packages
500 http://us.archive.ubuntu.com/ubuntu hirsute-updates/main i386
Packages
100 /var/lib/dpkg/status
0.99.10 500
500 http://us.archive.ubuntu.com/ubuntu hirsute/main amd64 Packages
500 http://us.archive.ubuntu.com/ubuntu hirsute/main i386 Packages
** Affects: software-properties (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1964839
Title:
software-properties-gtk crashes if APT::Periodic::Upgrade-Package-
Lists="3"
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