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Added Tails install guide
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<!--
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Title: How to install Tails on USB flash drive or SD card on macOS
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Description: Learn how to install Tails on USB flash drive or SD card on macOS.
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Author: Sun Knudsen <https://github.com/sunknudsen>
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Contributors: Sun Knudsen <https://github.com/sunknudsen>
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Reviewers:
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Publication date: 2021-05-05T14:49:08.692Z
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Listed: true
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-->
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# How to install Tails on USB flash drive or SD card on macOS
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## Requirements
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- Computer running macOS Mojave or Catalina
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- USB flash drive or SD card (faster is better)
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## Caveats
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- When copy/pasting commands that start with `$`, strip out `$` as this character is not part of the command
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## Guide
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### Step 1: install [Homebrew](https://brew.sh/)
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```shell
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/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
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```
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### Step 2: disable Homebrew analytics
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```shell
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brew analytics off
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```
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### Step 3: install [GnuPG](https://gnupg.org/)
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```shell
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brew install gnupg
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```
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### Step 4: download latest release of [Tails](https://tails.boum.org/install/download/index.en.html)
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### Step 5: set Tails release semver environment variable
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> Heads-up: replace `4.18` with [latest release](https://tails.boum.org/install/download/index.en.html) semver.
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```shell
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TAILS_RELEASE_SEMVER=4.18
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```
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### Step 6: download PGP signature of Tails release
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```shell
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curl -o ~/Downloads/tails-amd64-$TAILS_RELEASE_SEMVER.img.sig https://tails.boum.org/torrents/files/tails-amd64-$TAILS_RELEASE_SEMVER.img.sig
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```
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### Step 7: import “Tails developers” PGP public key
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```console
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$ curl https://tails.boum.org/tails-signing.key | gpg --import
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% Total % Received % Xferd Average Speed Time Time Time Current
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Dload Upload Total Spent Left Speed
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100 1334k 100 1334k 0 0 92536 0 0:00:14 0:00:14 --:--:-- 212k
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gpg: key 0xDBB802B258ACD84F: 2170 signatures not checked due to missing keys
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gpg: key 0xDBB802B258ACD84F: public key "Tails developers (offline long-term identity key) <tails@boum.org>" imported
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gpg: Total number processed: 1
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gpg: imported: 1
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gpg: key 0x4E2C6E8793298290: no user ID for key signature packet of class 10
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gpg: key 0x4E2C6E8793298290: no user ID for key signature packet of class 12
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gpg: key 0x4E2C6E8793298290: no user ID for key signature packet of class 12
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gpg: marginals needed: 3 completes needed: 1 trust model: pgp
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gpg: depth: 0 valid: 3 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 3u
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```
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imported: 1
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👍
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### Step 8: verify Tails release using GnuPG (learn how [here](../how-to-verify-pgp-digital-signatures-using-gnupg-on-macos))
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```console
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$ gpg --verify ~/Downloads/tails-amd64-$TAILS_RELEASE_SEMVER.img.sig
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gpg: assuming signed data in '/Users/sunknudsen/Downloads/tails-amd64-4.18.img'
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gpg: Signature made Mon 19 Apr 11:30:01 2021 EDT
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gpg: using EDDSA key CD4D4351AFA6933F574A9AFB90B2B4BD7AED235F
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gpg: Good signature from "Tails developers (offline long-term identity key) <tails@boum.org>" [unknown]
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gpg: aka "Tails developers <tails@boum.org>" [unknown]
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gpg: WARNING: This key is not certified with a trusted signature!
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gpg: There is no indication that the signature belongs to the owner.
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Primary key fingerprint: A490 D0F4 D311 A415 3E2B B7CA DBB8 02B2 58AC D84F
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Subkey fingerprint: CD4D 4351 AFA6 933F 574A 9AFB 90B2 B4BD 7AED 235F
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```
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Good signature
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👍
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### Step 9: clone Tails to USB flash drive or SD card
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> WARNING: DO NOT RUN THE FOLLOWING COMMANDS AS-IS.
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Run `diskutil list` to find disk ID of USB flash drive or SD card to overwrite with Tails (`disk2` in the following example).
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Replace `diskn` and `rdiskn` with disk ID of USB flash drive or SD card (`disk2` and `rdisk2` in the following example) and `tails-amd64-4.18.img` with current image.
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```console
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$ diskutil list
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/dev/disk0 (internal, physical):
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#: TYPE NAME SIZE IDENTIFIER
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0: GUID_partition_scheme *500.3 GB disk0
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1: EFI EFI 209.7 MB disk0s1
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2: Apple_APFS Container disk1 500.1 GB disk0s2
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/dev/disk1 (synthesized):
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#: TYPE NAME SIZE IDENTIFIER
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0: APFS Container Scheme - +500.1 GB disk1
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Physical Store disk0s2
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1: APFS Volume Macintosh HD - Data 340.9 GB disk1s1
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2: APFS Volume Preboot 85.9 MB disk1s2
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3: APFS Volume Recovery 529.0 MB disk1s3
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4: APFS Volume VM 3.2 GB disk1s4
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5: APFS Volume Macintosh HD 11.3 GB disk1s5
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/dev/disk2 (internal, physical):
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#: TYPE NAME SIZE IDENTIFIER
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0: FDisk_partition_scheme *15.9 GB disk2
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1: Windows_FAT_32 boot 268.4 MB disk2s1
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2: Linux 15.7 GB disk2s2
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$ sudo diskutil unmount /dev/diskn
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disk2 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
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$ sudo diskutil unmountDisk /dev/diskn (if previous step fails)
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Unmount of all volumes on disk2 was successful
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$ sudo dd bs=1m if=$HOME/Downloads/tails-amd64-4.18.img of=/dev/rdisk2
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1131+0 records in
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1131+0 records out
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1185939456 bytes transferred in 44.708618 secs (26525970 bytes/sec)
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$ sudo diskutil unmountDisk /dev/diskn
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Unmount of all volumes on disk2 was successful
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```
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👍
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