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# Recetas variadas
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## Añadir las claves GPG de un repo
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~~~~
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sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F7E06F06199EF2F2
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~~~~
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## Solucionar problemas de menús duplicados usando menulibre
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----------------------------------------------------------------------
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__Nota__: Ya no uso _MenuLibre_
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----------------------------------------------------------------------
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En el directorio `~/.config/menus/applications-merged` borramos todos
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los ficheros que haya.
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## Formatear memoria usb
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"The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes."
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Este comando borró todas las particiones de la memoria:
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`sudo dd if=/dev/zero of=/dev/sdd bs=2048 count=32 && sync`
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I'm assuming your using gparted.
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First delete whatever partitions you can...just keep pressing ignore.
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There will be one with a black outline...you will have to unmount
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it...just right click on it and unmount.
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Again you will have to click your way through ignore..if fix is an
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option choose it also.
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Once all this is done... you can select the device menu and choose new
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partition table.
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Select MSdos
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Apply and choose ignore again.
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Once it's done it show it's real size.
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Next you can format the drive to whichever file system you like.
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It's a pain in the behind this way, but it's the only way I get it
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done..I put live iso's on sticks all the time and have to remove
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them. I get stuck going through this process every time.
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## Copiar la clave pública ssh en un servidor remoto
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`cat /home/tim/.ssh/id_rsa.pub | ssh tim@just.some.other.server 'cat >> .ssh/authorized_keys'`
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O también:
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`ssh-copy-id -i ~/.ssh/id_rsa.pub username@remote.server`
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## ssh access from termux
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<https://linuxconfig.org/ssh-into-linux-your-computer-from-android-with-termux>
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## SDR instalaciones varias
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Vamos a trastear con un dispositivo [RTL-SDR.com](https://www.rtl-sdr.com/).
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Tenemos un montón de información en el blog de [SDR
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Galicia](https://sdrgal.wordpress.com/) y tienen incluso una guia de
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instalación muy completa, pero yo voy a seguir una guía un poco menos
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ambiciosa, por lo menos hasta que pueda hacer el curso que imparten
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ellos mismos (SDR Galicia)
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La guía en cuestión la podemos encontrar
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[aquí](https://ranous.wordpress.com/rtl-sdr4linux/)
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Seguimos los pasos de instalación:
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* La instalación de `git`, `cmake` y `build-essential` ya la tengo hecha.
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~~~~
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sudo apt-get install libusb-1.0-0-dev
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~~~~
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## Posible problema con modemmanager y micros programables
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Programando el _Circuit Playground Express_ con el _Arduino IDE_ tenía
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problemas continuos para hacer los _uploads_, al parecer el servicio
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_ModemManager_ es el culpable, se pasa todo el tiempo capturando los
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nuevos puertos serie por que considera que todo es un modem.
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Una prueba rápida para comprobarlo: `sudo systemctl stop ModemManager`
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Con esto funciona todo bien, pero en el siguiente arranque volvera a
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cargarse.
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Para dar una solución definitiva se puede programar una regla para
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impedir que el _ModemManager_ capture el puerto con un dispositivo
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Creamos un fichero con permisos de `root` en el directorio
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`/etc/udev/rules.d` que llamaremos: `99-arduino.rules`
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Dentro de ese fichero especificamos los codigos VID/PID que se deben ignorar:
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~~~~
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# for arduino brand, stop ModemManager grabbing port
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ATTRS{idVendor}=="2a03", ENV{ID_MM_DEVICE_IGNORE}="1"
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# for sparkfun brand, stop ModemManager grabbing port
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ATTRS{idVendor}=="1b4f", ENV{ID_MM_DEVICE_IGNORE}="1"
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~~~~
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Ojo que si tienes SystemV no va a funcionar.
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https://starter-kit.nettigo.eu/2015/serial-port-busy-for-avrdude-on-ubuntu-with-arduino-leonardo-eth/
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https://www.codeproject.com/Tips/349002/Select-a-USB-Serial-Device-via-its-VID-PID
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## Programar los nanos con chip ch340 o ch341
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Linux mapea el chip correctamente en un puerto `/dev/ttyUSB0` y con
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eso basta, que no te lien con el cuento de "drivers para linux"
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Todo lo que hace falta es configurar correctamente el _Arduino IDE_,
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hay que escoger:
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~~~~
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Board: "Arduino Nano"
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Processor: "ATmega168"
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Port: "/dev/ttyUSB0"
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~~~~
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Y ya funciona todo.
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## Linux Mint 20 es _python agnostic_
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En principio no podemos invocar a `python` por que no se ha escogido
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una versión por defecto.
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Tenemos dos opciones:
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~~~~{bash}
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apt install python-is-python2
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apt install python-is-python3
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~~~~
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## Instalar chromium sin snapdrop
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Este rodeo ya no es necesario en las versiones modernas de Linux Mint
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~~~~
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sudo apt install keepassxc gnucash deluge rsync grsync rar unrar \
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zip unzip unace bzip2 lzop p7zip p7zip-full p7zip-rar \
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most mc tree neofetch fasd silversearcher-ag ack mate-tweak filezilla \
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rofi
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~~~~
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