[Closed] Issues with Version 6

[dunhill]

Originally Posted by JSWolf

The error message is quite clear. You need to update GNU libc.

It's for a friend who has Linux Mint 19.3, I recommend doing a system update

[dhdurgee]

Originally Posted by dunhill

Calibre on linuxmint 20.2 with no problems

Did you install Qt6 first? If not, how is Calibre 6.0 working? If so, how did you get Qt6 installed? I don't see Qt6 in the mint/ubuntu repositories.

Do you have the DeDRM plugin installed and is it working? I have seen references to problems with it in this thread. In addition to this one I have the DeACSM and Hyphenate-this plugins installed and would need them all working before I could move from 5.44 here.

Dave

[kovidgoyal]

Originally Posted by chaley

I suspect it has something to do with Qt6's new high DPI code. They might be scaling the fonts or rendering them differently somehow, in the process making the letters a bit thinner. This idea is only a suspicion. I have no data to support it.

I actually think that for some fonts Qt is now choosing the light/medium faces rather than the regular face. Simply reselecting the font in Preferences->Look & feel where you can specify the exact face should fix it.

[kovidgoyal]

You dont need Qt 6, calibre comes with its own copy. All you need is a recent enough glibc and the installer will refuse to install if it detects you dont have one.

Originally Posted by dhdurgee

Did you install Qt6 first? If not, how is Calibre 6.0 working? If so, how did you get Qt6 installed? I don't see Qt6 in the mint/ubuntu repositories.

Do you have the DeDRM plugin installed and is it working? I have seen references to problems with it in this thread. In addition to this one I have the DeACSM and Hyphenate-this plugins installed and would need them all working before I could move from 5.44 here.

Dave

[kovidgoyal]

Originally Posted by peekpoke

From what I can tell, there is NO WAY to upgrade LIBC to a newer version.
The only solution is to upgrade your entire Linux machine to a version that uses LIBC 2.31.

Having done several linux upgrades, and had numerous things break taking days to fix... this is a pretty insane requirement!

https://www.digitalocean.com/communi...n-ubuntu-18-04

Expecting to use new software on arbitrarily old versions of linux is an insane requirement, given the idiotic compatibility policies of the linux ecosystem. If you want to stick with ancient distros, use ancient software on it. Or switch to windows, which takes compatibility more seriously, you can run calibre 6 on seven year old versions of windows 10 if you want.

[dhdurgee]

Originally Posted by kovidgoyal

You dont need Qt 6, calibre comes with its own copy. All you need is a recent enough glibc and the installer will refuse to install if it detects you dont have one.

Interesting. Is the Qt 6 you are providing installed such that other programs that want to use it can do so? I have another program that wants Qt 6 that I have been unable to upgrade due to Qt 6 not being available.

Dave

[kovidgoyal]

Originally Posted by dhdurgee

Interesting. Is the Qt 6 you are providing installed such that other programs that want to use it can do so? I have another program that wants Qt 6 that I have been unable to upgrade due to Qt 6 not being available.

Dave

No, only calibre can use its private copy of Qt6.

[dunhill]

Originally Posted by dhdurgee

Did you install Qt6 first? If not, how is Calibre 6.0 working? If so, how did you get Qt6 installed? I don't see Qt6 in the mint/ubuntu repositories.

Do you have the DeDRM plugin installed and is it working? I have seen references to problems with it in this thread. In addition to this one I have the DeACSM and Hyphenate-this plugins installed and would need them all working before I could move from 5.44 here.

Dave

I have their same plugins
But Kovid already answered above

[dhdurgee]

Originally Posted by kovidgoyal

No, only calibre can use its private copy of Qt6.

Is there a way to change that, so that others programs could use it?

Alternatively, should I find a way to get a shared copy of Qt6 installed, would your installer continue to install and calibre continue to use the private copy?

Dave

[kovidgoyal]

calibre binaries use private copies of everything except a few system libraries, by design.

[DNSB]

Originally Posted by net-buoy

Can confirm that return to 5.44 resolves the error.
Has anyone tried to add books after removing DeDRM? [Apparently that has been confirmed]
Has anyone posted to Apprentice Alf about this? [OK I posted this issue here: https://github.com/apprenticeharper/...sue-1302636037 for A^2]

Apprentices Harper and Alf have turned over maintenance of the DeDRM plugins to NoDRM See Issues: noDRM/DeDRM_tools to post any issues.

[DNSB]

Originally Posted by JSWolf

Download DeDRM 10.0.2 from https://github.com/noDRM/DeDRM_tools and also download the current code. Update 10.0.2 with the current code. Then go to post #75 in the thread (on page 5) and make the changes shown there so DeDRM can load libcrypto that comes with Calibre. Then install that over the existing DeDRM. That hopefully should work in MacOS.

No need to download the DeDRM 10.0.2 release. Download the current code. Unzip it and run the make-release.py file. This will generate the DeDRM_tools.zip. Open that file with a zip utility and extract DeDRM_plugin.zip and Obok_plugin.zip. Install either or both using the calibre => Preferences => Plug-ins => Load plug-in from file.

Edit: My test for this procedure was done on a MacOS Monterey 12.4 virtual machine. I copied over 4 non-DRMmed epubs and used DeACSM to load 2 epubs from .ascm files.

[slantybard]

Originally Posted by kovidgoyal

I actually think that for some fonts Qt is now choosing the light/medium faces rather than the regular face. Simply reselecting the font in Preferences->Look & feel where you can specify the exact face should fix it.

Thanks so much Kovid! This fixed the issue of thinned fonts for me.

[fanfa]

Originally Posted by DNSB

No need to download the DeDRM 10.0.2 release. Download the current code. Unzip it and run the make-release.py file. This will generate the DeDRM_tools.zip. Open that file with a zip utility and extract DeDRM_plugin.zip and Obok_plugin.zip. Install either or both using the calibre => Preferences => Plug-ins => Load plug-in from file.

Edit: My test for this procedure was done on a MacOS Monterey 12.4 virtual machine. I copied over 4 non-DRMmed epubs and used DeACSM to load 2 epubs from .ascm files.

Hi, this procedure is needed only for MacOS or also for Windows? I have installed calibre 6 and DeDRM 10.0.2 but it seems to work fine

Thanks

[ownedbycats]

Originally Posted by fanfa

Hi, this procedure is needed only for MacOS or also for Windows? I have installed calibre 6 and DeDRM 10.0.2 but it seems to work fine

Thanks

The issue only seems to affect Macs. If you're not getting crashes upon adding books, I wouldn't bother. I've been using DeDRM without issue on Windows.