I'm trying to upload a sketch to my arduino uno, but I get the Error-Message "avrdude: stk500_recv(): programmer is not responding" Arduino: 1.8.13 (Linux), Board: &quot;Arduino Uno&quot;

Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.


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I selected the right board (Arduino Uno)
I selected the right port
I selected &quot;USBasp&quot; as programmer
I reset the board multiple times
I have uploaded to the same port multiple times before without getting an Error
I disconnected the USB-cable multiple times and used a different one
I don't get the Error Message on a different board (also Arduino Uno)
When I'm trying to upload with the serial Monitor open i see an orange lamp (RX lamp) blinking in the same speed the Errors are given
When I'm trying to &quot;Burn Bootloader&quot; I get following Error:

Arduino: 1.8.13 (Linux), Board: &quot;Arduino Uno&quot;

avrdude: error: could not find USB device with vid=0x16c0 pid=0x5dc vendor='www.fischl.de' product='USBasp'
Error while burning bootloader.


This report would have more information with
&quot;Show verbose output during compilation&quot;
option enabled in File -&gt; Preferences.
The problem was an Bluetooth extension I connected to the board. I removed it, uploaded the program, reconnected it, and that worked!