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apt-mark hold only holds one package. where can I check to make sure packages don't install

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AlexanderLife

so sudo apt-mark hold seems to only hold the last packages.

sudo apt-mark hold shim
sudo apt-mark hold shim-signed
sudo apt-mark showhold

showhold shows just

shim-signed

if I do

sudo apt-mark hold shim-signed
sudo apt-mark hold shim
sudo apt-mark showhold

showhold shows just

shim

I thought maybe it was dependency combining as shim and shim-signed are related. so I tested it with a unrelated package.

sudo apt-mark hold shim-signed
sudo apt-mark hold ufoai
sudo apt-mark showhold

showhold shows just

ufoai

the last package is only one that shows up. I tried putting the command together.

sudo apt-mark hold shim shim-signed ufoai

it shows

ufoai was already set on hold
shim set on hold
shim-signed set on hold

then

sudo apt-mark showhold

showhold now shows something unexpected.

shim
shim-signed

ok this is what I wanted. so I

sudo apt-mark unhold ufoai

and it says

ufoai was already not hold.

I want to really make sure the Microsoft boot loader shim and shim-signed are not going to accidentally get on to my system. because I have a feeling it will be really hard for me to get it off my system. seems like a only with MS approval can this program can be run, type thing. at least that's what I get from this https://github.com/rhboot/shim. so my question is their some where I can check these packages are really on hold? is apt-mark hold the correct/best way to be doing this, what is if not? I am new-ish to linux so assume no basic knowledge.

lsb_release -a

shows

Description: Ubuntu 20.04.02 LTS

also

apt --version

shows

apt 2.0.5 (amd64)
81
0 + 0
apt
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