How to know which app is bad

I use Ubuntu Studio 18.04.3, with the additional backports PPA to get LTS, in three desktop PCs and one laptop.

Since a week, or so, each time I turn ON one of my desktop PCs, when all the initialization process is made (after the desktop is full shown), I get an error message:

There was a problem with one of the Ubuntu packages. Do you want to send a report about this? [Yes] [No] 

But… I wonder how can I know which package is and what kind of error is? Where can I find that kind of information?

BTW: I’ve sent the asked report each time I’ve got the message, but… Until now, I don’t have any kind of message from the Ubuntu team about that.

Do you know when your undead is destroyed?

I am a necromancer. My undead are created using animate dead. As I can only control 4HD per CL, when I go over this limit I must release them, but I get to choose which ones are released. This implies some kind of awareness of the undead you control when you are the creator, whereas using the feat command undead doesn’t say how it works in that regard (either you lose control of the oldest, as you choose, or simply unable to use it when full).

So as you are able to choose which undead you release, would you recognize when one of them that you created and still control, is destroyed?

My updates arent working and this is the error code in the terminal: Im new to ubuntu and don’t know how to fix this myself

E: The repository ‘cdrom://Ubuntu 18.04.3 LTS Bionic Beaver – Release amd64 (20190805) bionic Release’ does not have a Release file. N: Updating from such a repository can’t be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: buster InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 5C808C2B65558117 E: The repository ‘ buster InRelease’ is not signed. N: Updating from such a repository can’t be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

I want to know where there is the flaw in my argument

I came across following problem to finding whether the following language is decidable or semi-decidable or not even a semi-decidable.

$ L: \{\langle M\rangle: M\space is\space a\space TM\space and\space |L(M)| \ge3\}$

Now thinking intuitively I conjectured that this language is semi-decidable. We can say yes when the input does belong to $ L$ . But, we can not say no when the input does not belong to $ L$ .

Now, I formulated following reduction from complement of halting problem $ \overline{HP}$ which is not semi-decidable (non $ RE$ ).

$ \overline{HP}: \{\langle M, w\rangle : M\space is\space TM\space and\space it\space does\space not\space halt\space on\space string\space w.\}$

$ \tau(\langle M,x\rangle) = \langle M’\rangle$ .

$ M’$ on input $ w$ works as follows. It erases w, puts $ M$ and $ x$ on its tape, and runs $ M$ on $ x$ and accepts if $ M$ doesn’t halt on x. Otherwise it rejects.

Proof of validity of reduction:

$ \langle M,x\rangle \in \overline{HP} \implies M\space does\space not\space halt\space on\space x \implies M’\space accepts\space all\space inputs\space \implies|L(M’)| \ge 3\implies M’ \in L$

$ \langle M,x\rangle \notin \overline{HP} \implies M\space does\space halt\space on\space x \implies M’\space rejects\space all\space inputs\space \implies|L(M’)| < 3\implies M’ \notin L$

According to above reduction $ \overline{HP}$ should be recursively enumerable$ (RE)$ which it is not. So, $ L$ should not be $ RE$ but it indeed is $ RE$ . So, my reduction must be flawed.

Please point out where I messed up.

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How am I supposed to know what abilities familiars have naturally?

This seems to be a weird issue, the method of creating Familiars in Pathfinder 2e seems freeform at first but then when you get to the specifics of it, it seems you must know the exact stats of creatures that the games doesn’t provide. Below is the entry from the core rulebook that is causing the issue

PF2E Core Rulebook pg. 218: Each day, you channel your magic into two abilities, which can be either familiar or master abilities. If your familiar is an animal that naturally has one of these abilities (for instance, an owl has a fly Speed), you must select that ability. Your familiar can’t be an animal that naturally has more familiar abilities than your daily maximum familiar abilities.

Even the example given of the owl doesn’t appear in either the core rulebook or beastiary (as far as I can tell). So while I can naturally infer that all flying creatures will have a fly speed I can’t infer the stats of what everything else would have naturally. Do owls also have darkvision? Would cats have a climb speed? etc.