Thanks so much, that is brilliant! 

 "It is still not clear to me whether your USB drive holds only your Electrum wallet files, or the entire Electrum directory including your wallet files and the software itself - can you open the Electrum software on your airgapped device without the USB drive connected?"

It only holds the Electrum wallet: two USB sticks: one for the red (hot), one for the blue (cold) version. It comes up once I bypass to the hard drive on my old laptop.

Thanks, guys, for your fast reply. My Electrum wallet only opens on the USB Drive in Linux. So I will try to download the Linux upgrade directly on the USB drive and transfer the file to the Electrum wallet. Hope I understand this correctly? 

"You say your cold wallet is "on the Linux USB drive" - can you elaborate? Do you have an entire OS and Electrum running live from this USB drive? Or do you have Linux and Electrum installed on an airgapped computer and it is simply the wallet file which is stored on the USB drive?"

My Electrum wallet is installed on a USB drive, and I access it on an airgapped computer (going on hard drive only, it is Linux, in essence, right?).
I have the cold and hot wallet version on the USB drive. So technically, can I download the upgrade directly on to the USB drive when connecting to the Internet? Many Thanks, in advance!

Hi, Can anyone help explain how to upgrade a cold storage Electrum wallet on the Linux USB drive?
It has not been used since 2017. I have the seed phrase, pass code, etc. It opens, but I cannot send it to the exchange.

Many Thanks, in advance!

Hi, TryNinja, Thank you for your reply. I created a new wallet with new addresses and now the transfer from Coinbase is stuck in 'pending' mode. The Electrum address seems to be valid: 1AMpKXkRsYvmfED1gkckj488gmSyFLbmnc

Coinbase usually deducts a fee first, but this time it got into the 'Sent' file without a fee, so I just sent more funds to cover it.  This transaction has been sitting in 'pending' for 10 days.

When I am checking on the blockchain there is no transaction id. Not sure if Coinbase is holding it or it is not moving because there is no fee included. Do you think it will end up back in my Coinbase wallet?  Or maybe an Electrum wallet is too suspicious to them?

Hi,
Can you help with this pending unconfirmed transaction to this wallet?
1AMpKXkRsYvmfED1gkckj488gmSyFLbmnc

Hash: 66a8f39c834719f25801a3ff84fc60cc6516259a
Much gratitude!

Hi, All,
I have a cold storage Electrum wallet and for several days I tried to move my BTC to one of its addresses from my Coinbase exchange account. Coinbase calls them invalid addresses.
The latest one I tried to use is: 1F99d7sV8FChKADUkNETMtqQyYkf43vKH7
It is a bitkey Electrum offline wallet on 2 USB sticks. In the past the transfers used to work fine. Currently I am using the USB sticks on a different laptop. Should this be causing the problem? Any help would be greatly appreciated.