Monerod was working correctly, but suddenly stopped. I tried downloading the latest version (monero-gui-0.11.0.0) in the hopes that that would solve the problem, but it doesn't. When I try to start the program through the terminal rather than via the GUI, I am told the program doesn't exist even though the ls command shows it very clearly.
I am running Ubuntu 14.04, and was doing so when it worked correctly earlier.
The bitmonero.log says:
2017-09-14 10:57:06.331 7f1519564780 INFO logging contrib/epee/src/mlog.cpp:148 New log categories: *:WARNING,net:FATAL,net.p2p:FATAL,net.cn:FATAL,global:INFO,verify:FATAL,stacktrace:INFO,logging:INFO,msgwriter:INFO
2017-09-14 10:57:06.331 7f1519564780 ERROR msgwriter src/common/scoped_message_writer.h:102 Error: Couldn't connect to daemon: 127.0.0.1:18081
And the monero-wallet-gui. log says:
2017-09-14 10:56:52.394 7fab3bc417c0 INFO logging contrib/epee/src/mlog.cpp:148 New log categories: *:WARNING,net:FATAL,net.p2p:FATAL,net.cn:FATAL,global:INFO,verify:FATAL,stacktrace:INFO,logging:INFO,msgwriter:INFO
2017-09-14 10:56:52.792 7fab3bc417c0 INFO logging contrib/epee/src/mlog.cpp:156 New log categories: *:WARNING,net:FATAL,net.p2p:FATAL,net.cn:FATAL,global:INFO,verify:FATAL,stacktrace:INFO,logging:INFO,msgwriter:INFO
2017-09-14 10:56:52.991 7fab3bc417c0 INFO logging contrib/epee/src/mlog.cpp:156 New log categories: *:WARNING,net:FATAL,net.p2p:FATAL,net.cn:FATAL,global:INFO,verify:FATAL,stacktrace:INFO,logging:INFO,msgwriter:INFO
2017-09-14 10:56:53.037 7fab1bfff700 ERROR net.http contrib/epee/include/storages/portable_storage.h:161 portable_storage: wrong binary format - signature mismatch
2017-09-14 10:56:53.037 7fab1bfff700 ERROR wallet.wallet2 src/wallet/wallet2.cpp:2128 !r. THROW EXCEPTION: error::invalid_password
2017-09-14 10:56:53.037 7fab1bfff700 WARN net.http src/wallet/wallet_errors.h:707 /home/vagrant/slave/monero-core-ubuntu-amd64/build/monero/src/wallet/wallet2.cpp:2128:N5tools5error16invalid_passwordE: invalid password
2017-09-14 10:56:53.038 7fab1bfff700 ERROR WalletAPI src/wallet/api/wallet.cpp:504 Error opening wallet: invalid password
2017-09-14 10:56:53.077 7fab1bfff700 ERROR WalletAPI src/wallet/api/wallet.cpp:553 Status_Critical - not storing wallet
2017-09-14 10:57:04.550 7fab1b7fe700 WARN net.dns src/common/dns_utils.cpp:487 WARNING: no two valid MoneroPulse DNS checkpoint records were received