The magic command has to be run from inside Tails (#16289)

wiki/src/news/version_3.12.mdwn

@@ -103,19 +103,20 @@ To fix this issue, you can try the following workarounds:
 
 - Try to fix your USB stick
 
-  If you are comfortable with the command line and have access to
-  another Tails system, execute the following command:
+  1. Reinstall your USB stick using the same installation method.
 
-  <p class="pre command">sgdisk --recompute-chs /dev/bilibop</p>
+  1. Start Tails for the first time and [[set up an administration
+     password|doc/first_steps/startup_options/administration_password]].
 
-  Or from another Linux system, run the following command:
+  1. Choose <span class="menuchoice">
+     <span class="guimenu">Applications</span>&nbsp;▸
+     <span class="guisubmenu">System Tools</span>&nbsp;▸
+     <span class="guimenuitem">Root Terminal</span>
+     </span> to open a <span class="application">Root Terminal</span>.
 
-  <p class="pre command">sgdisk --recompute-chs <span class="command-placeholder">device</span></p>
+  1. Execute the following command:
 
-  Replace:
-
-  - <span class="command-placeholder">device</span> with the device
-    name of your USB stick. For example, <span class="command">/dev/sdx</span>.
+     <p class="pre command">sgdisk --recompute-chs /dev/bilibop</p>
 
 # Get Tails 3.12