Does it make sense to have mobile wallet + desktop wallet from same brand?

[o_e_l_e_o]

Tail OS only supports the old version of Electrum 4.0.2 and it needs to be upgraded to the latest version by downloading from the official Electrum website.

It's not that Tails only supports version 4.0.2, but rather that's the version which is part of the Tails bundle. Tails is deliberately designed in such a way that you cannot upgrade individual components. You must download the appimage and run it as a standalone, as I said above.

Persistent storage on Tails OS is encrypted by default using LUKS (Linux Unified Key Setup) or Veracrypt.

Yes, but encrypting the persistent storage only is insufficient. The entire drive should be encrypted in a way so that if a malicious third party gains access to it, they can't hide malware on it alongside your installation of Tails which could alter the entropy your copy of Electrum generates, change addresses you copy and paste, or copy your private keys for transmission at a later time.

I am a bit over cautious, so this strategy works for me... 

I don't think that's over cautious at all. It is simply good sense not to have all your coins in a single wallet, regardless of how secure you think that wallet is.

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[LoyceV]

Persistent storage on Tails OS is encrypted by default using LUKS (Linux Unified Key Setup) or Veracrypt.

Yes, but encrypting the persistent storage only is insufficient. The entire drive should be encrypted in a way so that if a malicious third party gains access to it, they can't hide malware on it alongside your installation of Tails

I don't think you can encrypt the entire Tails USB stick. You mean it should ask for a password before it boots, right?

A simpler way to avoid tampering with your OS is burning a DVD-R, then write on it so you know it wasn't switched out. But if you're that worried about targeted physical attacks, encryption alone probably won't protect you.

[o_e_l_e_o]

I don't think you can encrypt the entire Tails USB stick. You mean it should ask for a password before it boots, right?

Correct.

Although I've not tried this with Tails specifically, there are multiple ways to encrypt an entire OS: https://wiki.archlinux.org/title/Dm-crypt/Encrypting_an_entire_system

You can even hide the encrypted OS inside a VeraCrypt hidden volume, allowing you to unlock a secondary decoy OS if forced to do so: https://veracrypt.eu/en/VeraCrypt%20Hidden%20Operating%20System.html

But my point was really this: Just sticking Tails on a USB drive and assuming that what you have is now completely safe or is comparable to a proper hardware wallet is a mistake. There are a lot more things which need to be considered which are far outside the scope of the average user. If you don't want to use a hardware wallet, then airgapping an old laptop will be the best option, rather than using Tails in this manner on a computer which is not airgapped.

[LoyceV]

assuming that what you have is now completely safe ~ is a mistake.

Agreed A false sense of security can make you sloppy.

[Flexystar]

You're asking different things. In the title, you're asking if it's okay to install the same wallet on different devices. I'd say that's fine (as long as the wallet itself can be trusted).

Then, you're asking this:

Now I want to ask whether there are Wallets that are secure, synchable in between the desktop app and mobile app together?

I don't think this exists. The transactions (in a HD wallet) will of course be synced through the blockchain, but the wallet itself (including the address labels) won't get synchronized.

For example if I am going to set up the wallet on desktop then I will have to enter the Private key there. In similar ways when I will set the wallet on my phone then also I will have to set the private key there.

That will work.

Is it going to be issue to insert my private keys on two different devices?

Well, "it depends": you asked for "wallets that are secure", but you should also make sure the OS is secure. If you use the same wallet on different devices, you need to make sure they're all secure.
Will there be an issue? Only if your phone gets compromised. Or your desktop. And that's the issue: you don't know that until it's too late, but by doing so, you're doubling the risk. And that's why I wouldn't do it.

I think you need to take a step back: what are you trying to accomplish? If you own a small amount in Bitcoin that you can afford to lose, you can just do what you're suggesting. It will be very convenient and you know (and accept) the risk.
But, and I assume that applies to most people: if you want to get an increasingly larger amount of Bitcoin, it's better to create different wallets for different purposes (and that's what I do). Sometimes I use the same wallet brand, sometimes I use the same seed, sometimes it's watch-only, and some are different wallets. That doesn't mean they're all loaded, but that's not really the point.

And then there's privacy. If you have $5 trillion in your mobile wallet, your local barista may be tempted to hit you on the head. And if you buy a jet, you may not want the seller to know you bought 2 jets from his competitor the other day.
Separate wallets for different purposes are great for privacy!

Jee makes lot of sense now. I think I know what I was going to do and it was entirely wrong concept that I had back of the mind. I think it is best to follow what you said in the summary, have different wallets for different purposes. Since there is no limit on how many addresses I can generate I think it is perfectly fine that I just keep the devices concept away for now. I mean exposing the same private key over and over on different device could bring me in a situation of mumble jumble!

Of course, if I am holding trillions then I am definitely going to keep it low profile about my wallet. 

I think you need to take a step back:

Yes, I already did after reading few of the replies initially. I am more or less going to trust paper wallet and hardware wallet. I wouldn't mind creating different one's as you mentioned.

Thanks for the heads up and also replying the long answer :-)

[BlackHatCoiner]

I don't think that's over cautious at all. It is simply good sense not to have all your coins in a single wallet, regardless of how secure you think that wallet is.

To me, the ideal wallet setup is this:

• Cold storage wallet, used very rarely (mainly to send coins to it). It works as savings for the long term.
• Cold storage wallet, used as frequently as you're making on-chain transactions.
• Hot storage wallet, used for micro-payments, or when you're in hurry. (includes lightning)

All of which are viewed by connecting to your own node, via some computer that is dedicated solely for that purpose only.

A simpler way to avoid tampering with your OS is burning a DVD-R, then write on it so you know it wasn't switched out.

How's DVD-R safer? I don't understand. If the DVD is one-time burned, then you probably can't run any OS on it. If it isn't one-time, then it works similarly to a USB? Curious, actually, I may be wrong. I haven't ever used DVD for anything beyond burning videos.

[LoyceMobile]

A simpler way to avoid tampering with your OS is burning a DVD-R, then write on it so you know it wasn't switched out.

How's DVD-R safer? I don't understand. If the DVD is one-time burned, then you probably can't run any OS on it. If it isn't one-time, then it works similarly to a USB? Curious, actually, I may be wrong. I haven't ever used DVD for anything beyond burning videos.

Using a (read only) DVD instead of USB means your OS can't be tampered with for sure. The moment you reboot, it's fresh again.
Your data can still be stored on any other encrypted partition.

[BlackHatCoiner]

Using a (read only) DVD instead of USB means your OS can't be tampered with for sure. The moment you reboot, it's fresh again.
Your data can still be stored on any other encrypted partition.

Okay. So, you'll need another storage device which will be used as encrypted partition, otherwise the OS cannot operate.

[o_e_l_e_o]

Okay. So, you'll need another storage device which will be used as encrypted partition, otherwise the OS cannot operate.

The OS will operate just fine, you just won't be able to save any data between sessions. Every time you boot from your DVD, it will be like a completely fresh install. But this is exactly how Tails is intended to be used. The "A" in Tails stands for amnesic - if you don't set up an encrypted persistent storage, then every time you boot Tails you'll be in a completely clean sessions with no memory of any previous sessions.

[BlackHatCoiner]

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I was having the impression that when the OS starts up, there has to be temporary storage for activities like writing logs, caching data, creating temporary files etc. And that when the computer shuts down, in the case of Tails, it erases what it wrote. But, apparently, unless you want a persistent storage, writing isn't necessary at all. It runs fully on memory.

On the contrary, Tails never writes anything to the hard disk and only runs from the memory of the computer. The memory is entirely deleted when you shutdown Tails, erasing all possible traces.

And it makes sense. If erasing files was to be processed when the computer shut down, it wouldn't work with power outages or force shutdowns.

[LoyceV]

I was having the impression that when the OS starts up, there has to be temporary storage for activities like writing logs, caching data, creating temporary files etc.

It sounds like you haven't tried it yet. I can only recommend doing so.
Most (if not all) Linux distributions boot into a working GUI straight from the installation DVD. Some offer the kernel option "toram" so you can remove the DVD (and run much faster), but that's optional. All of them create a virtual file system in RAM, where you can save files normally and even install packages (although this is quite limited when running Live Linux). The only difference is that's it all gone the moment you turn off your computer.