Please read instructions carefully and try to answer ( my ) questions only.

If you have to support your answer with references to manual, try to be specific.
( See footnote #4 )

Assuming the efibootmgr output came from UEFI firmware “boot sequence “.
Statement : “boot” devices are identified by hardware and multi entries “ubuntu”.
1.What are the entries called “ubuntu”? Definition ?
2. Where did they come from / generated by whom ?
3. If I disable the entry “ubuntu” and reboot, will it get regenerated ?

If so – how do I test my modifications ?

a@a-desktop:~$ efibootmgr

 BootCurrent: 0000
 Timeout: 1 seconds
 BootOrder: 0000,0007,0011,0006,0004,0008,0009,000A,000B,000C,000D,000E,000F,0010
 Boot0000* ubuntu
 Boot0004* USB  
 Boot0006* Hard Drive  
 Boot0007* ubuntu
 Boot0008* UEFI: Seagate BUP Ultra Touch 0004
 Boot0009* UEFI: Seagate BUP Ultra Touch 0004
 Boot000A* UEFI: Seagate BUP Ultra Touch 0004
 Boot000B* UEFI: Seagate
 Boot000C* UEFI: Seagate
 Boot000D* UEFI: Seagate
 Boot000E* UEFI: Seagate
 Boot000F* UEFI: Seagate
 Boot0010* UEFI: Seagate
 Boot0011* ubuntu

FOOTNOTES ( some are dupes )
When answering a question please:

  • Read the question carefully.
  • Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
  • If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
  • Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.