Debian

From a debian-boot mailing list:

A couple more options may help: it's sometimes possible that you've extracted the USB stick while files were still writing.

sudo dd \
  if=/debian-11.7.0-amd64-netinst.iso \
  of=/dev/sda \
  bs=1M oflag=dsync status=progress

This forces a sync on each write to the usb so you don't lose data and also gives you a brief status output on the size written.

• download kernel 5.17 source tar.gz file from kernel.org
• Unpack the source and apply the patch with cd linux; patch -p1 < patch_file
• Run "make localmodconfig"
• Compile (run "make")
• Install: sudo make modules_install install
• reboot and choose the new kernel in grub

# dpkg -s sc
Package: sc
Status: install ok installed
Priority: optional
Section: math
Installed-Size: 440
Maintainer: Adam Majer 
Architecture: amd64
Source: sc (7.16-4)
Version: 7.16-4+b3
Depends: libc6 (>= 2.14), libncurses6 (>= 6), libtinfo6 (>= 6)
Description: Text-based spreadsheet with VI-like keybindings
 "Spreadsheet Calculator" is a much modified version of the public-
 domain spread sheet sc, which was posted to Usenet several years ago
 by Mark Weiser as vc, originally by James Gosling. It is based on
 rectangular table much like a financial spreadsheet.
 .
 Its keybindings are familiar to users of 'vi', and it has most
 features that a pure spreadsheet would, but lacks things like
 graphing and saving in foreign formats.  It's very stable and quite
 easy to use once you've put a little effort into learning it.

# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux bullseye/sid
Release:        testing
Codename:       bullseye

When attaching an Android device to a Linux machine, you may see a popup with the message:

Unable to open MTP device "001,104"

The numbers may vary depending upon device and port:

# tail -f /var/log/kern.log
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.564694] usb 1-1: new high-speed USB device number 105 using xhci_hcd
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.714863] usb 1-1: New USB device found, idVendor=18d1, idProduct=4ee1, bcdDevice= 2.23
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.714865] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.714866] usb 1-1: Product: Nexus 6
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.714867] usb 1-1: Manufacturer: motorola
May  5 22:53:51 nuc8i7hvk01 kernel: [3205901.714868] usb 1-1: SerialNumber: ZX1G22MGK2

Further diagnostics generate:

# mtp-detect
libmtp version: 1.1.17

Listing raw device(s)
   No raw devices found.
root@nuc8i7hvk01:/home/rpb# mtp-detect
libmtp version: 1.1.17

Listing raw device(s)
Device 0 (VID=18d1 and PID=4ee1) is a Google Inc Nexus/Pixel (MTP).
   Found 1 device(s):
   Google Inc: Nexus/Pixel (MTP) (18d1:4ee1) @ bus 1, dev 103
Attempting to connect device(s)
error returned by libusb_claim_interface() = -6LIBMTP PANIC: Unable to initialize device
Unable to open raw device 0
OK.

On my system, the culprit is the gvfs filesystem packages:

# dpkg -l |grep gvfs
ii  gvfs:amd64       1.46.2-1  amd64  userspace virtual filesystem - GIO module
ii  gvfs-backends    1.46.2-1  amd64  userspace virtual filesystem - backends
ii  gvfs-common      1.46.2-1  all    userspace virtual filesystem - common data files
ii  gvfs-daemons     1.46.2-1  amd64  userspace virtual filesystem - servers
ii  gvfs-fuse        1.46.2-1  amd64  userspace virtual filesystem - fuse server
ii  gvfs-libs:amd64  1.46.2-1  amd64  userspace virtual filesystem - private libraries

# systemctl |grep gvfs
  run-user-1000-gvfs.mount   loaded active mounted   /run/user/1000/gvfs

# ps aux |grep gvfs
rpb         1886  0.0  0.0 241436  4036 ?        Ssl  Mar29   0:00 /usr/libexec/gvfsd
rpb         1891  0.0  0.0 753756  3364 ?        Sl   Mar29   0:26 /usr/libexec/gvfsd-fuse /run/user/1000/gvfs -f
rpb         2009  0.0  0.0 501008  4632 ?        Ssl  Mar29   0:00 /usr/libexec/gvfs-udisks2-volume-monitor
rpb         2041  0.0  0.0 237900  4828 ?        Ssl  Mar29   0:00 /usr/libexec/gvfs-mtp-volume-monitor
rpb         2061  0.0  0.0 239776  3052 ?        Ssl  Mar29   0:00 /usr/libexec/gvfs-gphoto2-volume-monitor
rpb         2069  0.0  0.0 237500  3052 ?        Ssl  Mar29   0:00 /usr/libexec/gvfs-goa-volume-monitor
rpb         2073  0.0  0.0 315992  3160 ?        Ssl  Mar29   0:41 /usr/libexec/gvfs-afc-volume-monitor
rpb         2135  0.0  0.0 391244  6824 ?        Sl   Mar29   0:02 /usr/libexec/gvfsd-trash --spawner :1.8 /org/gtk/gvfs/exec_spaw/0
rpb       178920  0.0  0.0 315892  3956 ?        Sl   Mar30   0:01 /usr/libexec/gvfsd-network --spawner :1.8 /org/gtk/gvfs/exec_spaw/1
rpb       178946  0.0  0.0 317528  3172 ?        Sl   Mar30   0:01 /usr/libexec/gvfsd-dnssd --spawner :1.8 /org/gtk/gvfs/exec_spaw/3
rpb       179014  0.0  0.0 206540  5372 ?        Ssl  Mar30   1:29 /usr/libexec/gvfsd-metadata

The file browser known as pcmanfs does not seem to be able to access the filesystem

Solution: Dolphin, as a substitute for Nautilus, can be used to access the virtual filesystems.

The command gio can be used to access the file system:

# gio
Usage:
  gio COMMAND [ARGS…]

Commands:
  help     Print help
  version  Print version
  cat      Concatenate files to standard output
  copy     Copy one or more files
  info     Show information about locations
  list     List the contents of locations
  mime     Get or set the handler for a mimetype
  mkdir    Create directories
  monitor  Monitor files and directories for changes
  mount    Mount or unmount the locations
  move     Move one or more files
  open     Open files with the default application
  rename   Rename a file
  remove   Delete one or more files
  save     Read from standard input and save
  set      Set a file attribute
  trash    Move files or directories to the trash
  tree     Lists the contents of locations in a tree

Use “gio help COMMAND” to get detailed help.

Background info via Wikipedia, which comes with a set of back-ends, including trash support, SFTP, FTP, WebDAV, SMB, and local data via Udev integration, OBEX, MTP and others.

• Don't know why this has to be so difficult on Debian, why all the competing applications which lock each other out?
• Remember: on Android, once connected, select transfer files
• May need to open a new dolphin window to actually get at the files
• And then in Dolphin, the actual right-click/copy/paste doesn't actually work -- need to load a file and then save it.... just painful .. I hope other's experience is less painful ... maybe I have to rebuild my machine

• DebianInstaller - wiki starting point for many things installer
• Debian Installer Internals - introduction to the inner workings of the installer when it is running, its components (udebs) and its build system.
• Debian GNU/Linux Installation Guide - installation instructions for the Debian GNU/Linux system for the 64-bit PC (“amd64”) architecture. It also contains pointers to more information and information on how to make the most of your new Debian system.
• Netboot Assistant - provides a tool to simplify the preparation of files for TFTP net booting
• UEFI - describe UEFI for Debian purposes: what's supported in Debian and how to use it, plus some troubleshooting tips.
• Installing Debian using network booting - describes installing a new Debian system with no CD, DVD, USB at all. By the end of the installation process, the new machine is able to run without the support of the server. During the installation, you will need a network boot server.

When in the grub prompt, these two commands provide good situational awareness:

• run the 'set' command to see what the current boot and network variables are.
• run the 'ls' command to see what devices and partitions are available

Then something like 'ls (hd0,gpt1)/boot' can show files in that partition

When running manual boot operations in the grub menu on a Dell Wyse 3040, something along the lines of the following might be used:

grub> linux (hd0,gpt2)/vmliunz root=/dev/mmcblk0p2 ro
grub> initrd (hd0,gpt2)/initrd.img
grub> boot

At Grub not loading config file or booting into linux automatically shows the trick of starting the grub menu:

grub> configfile (hd0,gpt4)/boot/grub/grub.cfg

Is it possible to shift+page-up to reveal the backtrace? The backtrace section ends with "---[ end trace 75435… ]---" If that's not possible, see if you can get a copy from /var/log after rebooting with a working kernel or when using a network disk. If that's not possible, and you have good reflexes, you could try ctr+s or scroll-lock to pause the kernel output at just the right moment, but it's probably easier to just set up remote logs:

https://wiki.debian.org/Rsyslog

• Chapter 4. Common kernel-related tasks - Debian Handbook

From Debian Misc Developer News (#51):

Steve McIntyre created[3] a debian-preseed[4] service that extracts all of the debconf templates in the Debian archive and lists each of the possible preseed options available along with their descriptions. If you want to repeat the extractions, you can use Steve's new Perl script or the existing tools on the preseed wiki page[5].

-- Paul Wise

• [3] https://blog.einval.com/2020/02/24#what_can_you_preseed
• [4] https://jack.einval.com/debian-preseed/
• [5] https://wiki.debian.org/DebianInstaller/Preseed

From the debian-boot mailing list:

 * pkgsel:
    - Ensure tasksel is installed, regardless of its priority.
    - Add preseedable pkgsel/run_tasksel debconf template, making it
      possible (by setting it to false) to skip tasksel entirely
      (installation and prompt), while still benefiting from other
      pkgsel features.
 * preseed:
    - Update auto-install/defaultroot, replacing buster with bullseye.

Has loads of scripts and conditional actions going on, and is intended to work either from a remote server, or from a directory that d-i can see: hands.com/d-i/

he initrd of d-i can indeed be extended / appended. And in the "appendix" goes the desired extras. Then

d-i preseed/early_commands /myextras/early_script

On my Debian desktop, I have both of my primary monitors in portrait mode, with a third monitor in landscape mode. The login screen is therefore rotated 90 degrees from how it needs to be. After login, I need to manually go into System Settings, and manually rotate the monitors.

That is, up until now. A little poking around says I need to:

apt install arandr

This is a GUI application which will create a script in .screenlayout which can be auto-started upon login:

$ cat .screenlayout/bythree.sh
#!/bin/sh
xrandr \
  --output DisplayPort-0 --primary --mode 3840x2160 --pos 0x8 --rotate right \
  --output DisplayPort-1 --mode 3840x2160 --pos 2160x0 --rotate right \
  --output DisplayPort-2 --off \
  --output DisplayPort-3 --mode 2560x1600 --pos 4320x0 --rotate normal \
  --output HDMI-A-0 --off \
  --output HDMI-A-1 --off

This can be autostarted in LXDE with:

$ cat ~/.config/lxsession/LXDE/autostart
@lxpanel --profile LXDE
@pcmanfm --desktop --profile LXDE
@xscreensaver -no-splash
#@~/.screenlayout/bythree.sh    <= does not work
#@${HOME}/.screenlayout/bythree.sh   <= does not work
# make sure there is a line return at end of command:
@/home/me/.screenlayout/bythree.sh

Instructions for the autostart file can be found at LXSession.

When needing to rebuild a personal linux machine, some suggested commands to collect state:

dpkg --get-selections > ~/mint/Package.list
apt-key exportall > ~/mint/Repo.keys
crontab -u wgking -l > ~/mint/crontab.backup

For some odd reason, my Bluetooth based mouse stopped working on my Debian Linux workstation. Going into the Bluetooth control panel in Settings indicated that no Bluetooth Adapter could be found.

In scouring the help groups, the solution is to go into BIOS, disable Bluetooth, reboot, restart into BIOS, and enable Bluetooth. In the end, this revived my Bluetooth adapters and devices.

At one point in time, removing 'quiet' and placing 'text' on the grub/linux command line would boot in to console mode, the current way to do that is the remove 'quiet' and add the following to the linux kernel command line:

systemctl set-default multi-user.target

I need to keep this around and see what it does to the boot up log listing (based upon Force Debian console into text mode, it can be used when ILO complains of "Monitor is in graphics mode or an unsupported text mode.":

GRUB_CMDLINE_LINUX_DEFAULT="nomodeset"

Another useful function is the following to disable graphical terminal in the grub boot file (use update-grub after any changes):

GRUB_TERMINAL=console