How to fix undefined symbol error for Digikam on Ubuntu 22.04

Question

I have upgraded a number of computers from Ubuntu 21.10 to 22.04. After the update, I cannot run DigiKam on one of them. I tried to remove, purge and reinstall digikam, libgdal, and libblosc1 - without success.DigiKam stops before opening any window or even the splash screen.

$ digikam
digikam: symbol lookup error: /lib/libgdal.so.30: undefined symbol: blosc_cbuffer_validate
$ 

I tried to find that symbol (blosc_cbuffer_validate) in libgdal. The symbol is undefined in the library, indeed, but that is equally the case on my other computers where digikam starts normally.

$ nm -gD /lib/libgdal.so.30 | grep blosc_cbuffer
                 U blosc_cbuffer_validate 
$

I was wondering in what way the computer that cannot run DigiKam anymore is different from the others, and can only think of these two differences:

• DigiKam was installed before the upgrade to Ubuntu 22.04
• It has an AMD Ryzen CPU, whereas the others have Intel i7.

What may be the problem? How can I solve it? Short of a solution, how could I narrow it down?

Answer 1

It is defined in libblosc1.

$ sudo apt install libblosc1

And verify with:

$ nm -gD /usr/lib/libblosc.so.1 | grep blosc_cbuffer
0000000000004580 T blosc_cbuffer_complib
0000000000004530 T blosc_cbuffer_metainfo
0000000000004440 T blosc_cbuffer_sizes
00000000000044b0 T blosc_cbuffer_validate
0000000000004570 T blosc_cbuffer_versions

UPDATE: Please provide the output of $ ldd digikam

UPDATE: It is loading the wrong file from /opt which can be fixed with:

$ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libblosc.so.1 digikam

Or by changing the LD_LIBRARY_PATH or by removing the version in /opt.