Luis López betolink

Enable PipeWire on Ubuntu 22.04

This guide is only for original Ubuntu out-of-the-box packages. If you have added a custom PPA like pipewire-debian, you might get into conflicts.

Ubuntu 22.04 has PipeWire partially installed and enabled as it's used by browsers (WebRTC) for recoding the screeen under Wayland. We can enable remaining parts and use PipeWire for audio and Bluetooth instead of PulseAudio.

Starting from WirePlumber version 0.4.8 automatic Bluetooth profile switching (e.g. switching from A2DP to HSP/HFP when an application needs microphone access) is supported. Jammy (22.04) repos provide exactly version 0.4.8. So, we're good.

Based on Debian Wiki, but simplified for Ubuntu 22.04.

Fallacy #1. The network is reliable

Why the pattern Client-Response might cause some troubles?
What are distributed objects?
How we can solve this problem?

Fallacy #2. Latency isn't a problem

How many calls do you do between services before replying a syncronous call to the end user?
Which pattern is more common in your application? Remote calls or messages?

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

It's hard to quarrel with that ancient justification of the free press: "America's right to know." It seems almost cruel to ask, ingeniously, "America's right to know what, please? Science? Mathematics? Economics? Foreign languages?"

None of those things, of course. In fact, one might well suppose that the popular feeling is that Americans are a lot better off without any of that tripe.

There is a cult of ignorance in the United States, and there always has been. The strain of anti-intellectualism has been a constant thread winding its way throughout political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."

Politicians have routinely striven to speak the language of Shakespeare and Milton as ungrammaticaly as possible in order to avoid offending their audiences by appearing to have gone to school. Thus, Adlai Stevenson, who incautiously allowed intelligence and learning and wit to peep out of his speeches, found the American people

You might want to read this to get an introduction to armel vs armhf.

If the below is too much, you can try Ubuntu-ARMv7-Qemu but note it contains non-free blobs.

Running ARM programs under linux (without starting QEMU VM!)

First, cross-compile user programs with GCC-ARM toolchain. Then install qemu-arm-static so that you can run ARM executables directly on linux

	import argparse
	import json
	import operator
	from collections import defaultdict
	from dataclasses import dataclass
	from functools import partial, reduce
	import os
	from typing import Any, Union
	from configparser import ConfigParser
	from pathlib import Path

	import pandas as pd
	import hvplot.pandas
	import panel as pn

	pn.extension(sizing_mode="stretch_width")

	PALETTE = [
	"#ff6f69",
	"#ffcc5c",
	"#88d8b0",

	# Requirements:
	# HDF5 library version 1.10.5 or later
	# h5py version 3.0 or later
	# pip install git+https://github.com/HDFGroup/zarr-python.git@hdf5

	import logging
	from urllib.parse import urlparse, urlunparse
	import numpy as np
	import h5py
	import zarr

	Development Status :: 1 - Planning
	Development Status :: 2 - Pre-Alpha
	Development Status :: 3 - Alpha
	Development Status :: 4 - Beta
	Development Status :: 5 - Production/Stable
	Development Status :: 6 - Mature
	Development Status :: 7 - Inactive
	Environment :: Console
	Environment :: Console :: Curses
	Environment :: Console :: Framebuffer

	sudo wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo
	sudo sed -i s/\$releasever/6/g /etc/yum.repos.d/epel-apache-maven.repo
	sudo yum install -y apache-maven
	mvn --version