Userland: Bug report - [Cannot install a Desktop package -> E: Sub-process /usr/bin/dpkg returned an error code (1)]

[Enzycal]

Describe the bug

The problem occurs after starting VNC.

After attempting to install a desktop package it fails returing an error.

Setting up pavucontrol (3.0-4) ...
Setting up xfdesktop4 (4.12.4-2) ...
Setting up thunar (1.8.4-1) ...
Setting up xfce4-session (4.12.1-6) ...
update-alternatives: using /usr/bin/startxfce4 to provide /usr/bin/x-session-man alter (x-session-manager) in auto mode
Setting up thunar-volman (0.9.1-1) ...
Processing triggers for menu (2.1.47+b1) ...
Processing triggers for initramfs-tools (0.133+deb1Oul) ...
Processing triggers for libc-bin (2,28-10) ...
Setting up xfce4 (4.12.5) ...
Processing triggers for systemd (241-7"deb10u1) ...
Setting up xorg (1:7.7+19) ...
Processing triggers for dbus (1.12.16-1) ...
Processing triggers for libgdk-pixbuf2.0-0:arm64 (2.38.1+dfsg-1) ...
Errors were encountered while processing:
udisks2
gvfs-daemons
gvfs:arm64
E: Sub-process /usr/bin/dpkg returned an error code (1)
An error occurred installing packages, please try again and if it persists provi de this log to the developer, I Press any key to close...

Steps to reproduce the behavior:

From the main menu select Distribution -> Debian or Ubuntu, enter the info and start VNC. In the open terminal type to install a desktop package (lxde, xfce, mate): sudo apt-get install lxde

or

From the main menu select Desktop-> Xfce, enter the info and start VNC. the installation automatically starts.

Screenshots

https://imgur.com/a/iNmu3Qi

When selecting Desktop -> lxde: https://imgur.com/a/2gM1iez

Device Information

Device: Samsung Galaxy Note 10+ 512Gb
Android Version: 9
UserLAnd Version 2.6.4
Device is NOT rooted.
Running stock ROM.

[valadina223]

Installing XFCE worked for me today. But instead LXDE does not work today. Have you tried again?

[Enzycal]

Just tried both, still doesn't work.

[valadina223]

Hm, strange. Worked for me yesterday. Seems the installation routine is really fragile.
If you don't get it to work at all, maybe you want to have a look at AnLinux. They basically do they same, offering XFCE, LXDE, LXQT. Tried all of them yesterday, works without any hassle.

[fabiosammy]

I have this same problem in this android device. It's a strange issue with udisks2. Maybe it's related with https://github.com/termux/termux-packages/issues/1359 but i don't know how to solve.

[corbinlc]

Issue relates to /var/lib/dpkg/info/udisks2.postinst doing this udevadm trigger --subsystem-match=block --action=change. Looking at this now.

[corbinlc]

Ok. Simply clicking on the xfce or lxde icons now works (may require a setting up a new filesystem if already broken). If people want to install a desktop on their own and they run into the same problem with udisks2, the workaround I ultimately used is...
instead of just doing something like this:
sudo apt install xfce4
the scripts now do something like this:

sudo apt install udisks2
sudo rm /var/lib/dpkg/info/udisks2.postinst
sudo dpkg --configure udisks2
sudo apt install xfce4

This issue has been fixed in later version of the udev package where the issue really resides, and so this workaround can be removed later when those packages become part of stable.

So, one way or another, you should be able to proceed now. Enjoy!

Some references:
Example commit that fixes this:
https://github.com/CypherpunkArmory/UserLAnd-Assets-Support/commit/f6994c0701c859a9ce1362df14e18ecfc27e076f
Discussion about the underlying problem:
https://salsa.debian.org/utopia-team/udisks2/merge_requests/2
Fix for the underlying problem:
https://github.com/systemd/systemd/pull/11346/files

[corbinlc]

Went ahead and mentioned this issue on the Wiki->FAQ, will add more info there later.