My guess is that your .jpg file isn't really in .jpg format. Try another, known .jpg file and see if the same thing happens.
I just upgraded my pc (hd install) with the latest knoppix ..
I loaded up the gimp and then tried to open a jpg file that I d/l from the web... and I get this error:
" GIMP Message
Opening '/path to my file.......jpg...' failed:
Plug-in could not open image".
HELP !!!!!!!!!!!!
I used apt-get to remove the gimp, then I used it to re-download and install it but I get the same error both ways !
Any ideas on how to fix this?????
My guess is that your .jpg file isn't really in .jpg format. Try another, known .jpg file and see if the same thing happens.
Do file filename.jpg to see what it is.
I have verified that they are in fact jpg files.
I also tried with a few known jpg files and I get the same error.
What can this be ????
Did you use apt-get remove --purge to be sure configs are overwritten with new ones?

SFP TO RJ45 TRANSCEIVER SFP MODULE COPPER SFP OPTICAL PORT TO RJ45 ETHERNET PORT
$7.99
Dell Intel X710-DA2 5N7Y5 Dual-Port 10GbE SFP+ PCIe 3.0 x8 Network Adapter
$27.50
Cisco Acacia DP04QSDD-E25-840 400G QSFP-DD Coherent DCO Transceiver Module
$699.99
NEW Sealed Cisco SFP-10G-LR 10GBASE-LR SFP+ 1310nm 10km *US Shipping*
$24.00
Genuine Cisco SFP-10G-SR 0-2415-03 10 Gigabit Transceiver
$5.40
Intel X520-DA2 10Gb 10Gbe 10 Gigabit Network Adapter NIC Dual Port E10G42BTDA
$28.94
HP 560SFP+ 10GB 2-port PCIe NIC Ethernet ADAPTER 669279-001 w/ (2) 10GB SFP+
$16.99
Lot of 5 Cisco 10G SFP+ 850nm 300m Transceiver Module P/N: SFP-10G-SR-10-2415-03
$15.00
Dell 10 Gigabit SFP+ SR Transceiver 0XYD50 NEW SEALED
$24.99
Cisco Catalyst WS-C3650-12X48UQ-L 48 Port UPOE 4x 10G SFP+ Switch
$175.00