@wrcombs My newbness is about to show again.

When I look at sources.list, some lines are preceded by a single hash plus a space (# ), some by a double hash plus a space (## ), and some with no hash at all.

Do I need to add any hashes? I ask b/c I added the lines without hashes, and this is the result

Hit:1 https://dl.winehq.org/wine-builds/ubuntu artful InRelease
Hit:2 http://archive.canonical.com/ubuntu bionic InRelease
Hit:3 https://dl.winehq.org/wine-builds/ubuntu xenial InRelease
Hit:4 http://security.ubuntu.com/ubuntu bionic-security InRelease
Hit:5 https://repo.skype.com/deb stable InRelease
Hit:6 http://ca.archive.ubuntu.com/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/elementary-os/daily/ubuntu bionic InRelease
Hit:8 http://ca.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:9 http://ca.archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit:10 http://ppa.launchpad.net/apt-fast/stable/ubuntu bionic InRelease
Hit:11 http://ppa.launchpad.net/atareao/atareao/ubuntu bionic InRelease
Hit:12 http://ppa.launchpad.net/linrunner/tlp/ubuntu bionic InRelease
Ign:13 http://ppa.launchpad.net/relan/exfat/ubuntu bionic InRelease
Hit:14 http://ppa.launchpad.net/ubuntuhandbook1/apps/ubuntu bionic InRelease
Err:15 http://ppa.launchpad.net/relan/exfat/ubuntu bionic Release 404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/relan/exfat/ubuntu 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.

sigh

Thank you for all your help; your google-fu is better than mine, even if it came to nothing. Looks like I'm finally forced to check out a wireless method this afternoon.

@wrcombs said in Ubuntu 18.04 Live exfat:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A3211A87D7ACFE23
sudo apt update

Just tried it. It came back

gpg: key A3211A87D7ACFE23: 3 signatures not checked due to missing keys
gpg: key A3211A87D7ACFE23: "Bofu Chen (bafu) <[email protected]>" not changed
gpg: Total number processed: 1
gpg: unchanged: 1

Perhaps I'm missing something that y'all already have installed? I'm mostly a newb who just follows the It's Foss site for recommended first things to do after installing whatever Ubuntu version (in this case 18.04 LTS).

If it matters, when I right click a file and select "Copy to..." and then select a microSD as the destination, it errors out as

Error while copying to "[name of card]".
The destination is read-only.

..yet I transferred files to this card two days ago.

I have no idea whether there's a difference between SSD and microSD, when they're formatted with the same structure.

Do you think it matters that I used this card in a new android device (Lenovo tablet) yesterday? (The files copied to the microSD were .mp4 and .mkv files, and I deleted them from the card using the new tablet.)

@wrcombs I feel I should add that, until last night, the following had been working for me:

sudo apt-get install exfat-fuse exfat-utils

Last night, functionality changed. I can still read exFAT microSD cards, but I can't write to them. I did try

sudo apt-get remove exfat-fuse

then reinstalling with the original code. That failure brought me here.

Anyway, I don't know what's different. All I've been using the Terminal for is daily update/upgrade, and launching Firefox.

@wrcombs I tried your recommendation.

sudo add-apt-repository ppa:relan/exfat

gave me

tag:launchpad.net:2008:redacted
More info: https://launchpad.net/~relan/+archive/ubuntu/exfat
Press [ENTER] to continue or Ctrl-c to cancel adding it.

'Error reading https://keyserver.ubuntu.com/pks/lookup?op=get&options=mr&exact=on&search=0xtag:launchpad.net:2008:redacted: Not Found'

So I manually added

ppa:relan/exfat

to my repositories. So far, so good. Then

sudo apt-get update && sudo apt-get install fuse-exfat exfat-utils

gave me

Hit:1 http://archive.canonical.com/ubuntu bionic InRelease
Hit:2 http://ca.archive.ubuntu.com/ubuntu bionic InRelease
Hit:3 https://dl.winehq.org/wine-builds/ubuntu artful InRelease
Hit:4 http://ppa.launchpad.net/apt-fast/stable/ubuntu bionic InRelease
Hit:5 https://dl.winehq.org/wine-builds/ubuntu xenial InRelease
Get:6 http://ca.archive.ubuntu.com/ubuntu bionic-updates InRelease [83.2 kB]
Hit:7 https://repo.skype.com/deb stable InRelease
Get:8 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]
Hit:9 http://ppa.launchpad.net/atareao/atareao/ubuntu bionic InRelease
Hit:10 http://ppa.launchpad.net/linrunner/tlp/ubuntu bionic InRelease
Get:11 http://ca.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Ign:12 http://ppa.launchpad.net/relan/exfat/ubuntu bionic InRelease
Hit:13 http://ppa.launchpad.net/ubuntuhandbook1/apps/ubuntu bionic InRelease
Err:14 http://ppa.launchpad.net/relan/exfat/ubuntu bionic Release 404 Not Found [IP: 91.189.95.83 80]
Get:15 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [104 kB]
Get:16 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [114 kB]
Get:17 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [70.9 kB]
Get:18 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [71.0 kB]
Get:19 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages [64.9 kB]
Get:20 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [74.9 kB]
Get:21 http://security.ubuntu.com/ubuntu bionic-security/universe i386 Packages [21.8 kB]
Get:22 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [21.8 kB]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/relan/exfat/ubuntu 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.

I searched "See apt-secure(8) manpage for repository creation and user configuration details" but the successful answers seem to be one of two options:

• something specific to the application, such as adding a key for something unannounced,
• or the recommendation to remove the PPA, which would leave me without an exFAT solution.

I don't know what to do next. Do you have any advice?